diff --git a/i3bar/include/common.h b/i3bar/include/common.h
index 50d1c7b9..f0b53814 100644
--- a/i3bar/include/common.h
+++ b/i3bar/include/common.h
@@ -49,7 +49,7 @@ struct status_block {
 
     bool urgent;
     bool no_separator;
-    bool is_markup;
+    bool pango_markup;
 
     /* The amount of pixels necessary to render a separater after the block. */
     uint32_t sep_block_width;
diff --git a/i3bar/src/child.c b/i3bar/src/child.c
index cfc96d5f..e73a2920 100644
--- a/i3bar/src/child.c
+++ b/i3bar/src/child.c
@@ -206,7 +206,7 @@ static int stdin_string(void *context, const unsigned char *val, size_t len) {
         return 1;
     }
     if (strcasecmp(ctx->last_map_key, "markup") == 0) {
-        ctx->block.is_markup = (len == strlen("pango") && !strncasecmp((const char *)val, "pango", strlen("pango")));
+        ctx->block.pango_markup = (len == strlen("pango") && !strncasecmp((const char *)val, "pango", strlen("pango")));
         return 1;
     }
     if (strcasecmp(ctx->last_map_key, "align") == 0) {
@@ -275,15 +275,15 @@ static int stdin_end_map(void *context) {
 
     if (new_block->min_width_str) {
         i3String *text = i3string_from_utf8(new_block->min_width_str);
-        i3string_set_markup(text, new_block->is_markup);
+        i3string_set_markup(text, new_block->pango_markup);
         new_block->min_width = (uint32_t)predict_text_width(text);
         i3string_free(text);
     }
 
-    i3string_set_markup(new_block->full_text, new_block->is_markup);
+    i3string_set_markup(new_block->full_text, new_block->pango_markup);
 
     if (new_block->short_text != NULL)
-        i3string_set_markup(new_block->short_text, new_block->is_markup);
+        i3string_set_markup(new_block->short_text, new_block->pango_markup);
 
     TAILQ_INSERT_TAIL(&statusline_buffer, new_block, blocks);
     return 1;
diff --git a/include/libi3.h b/include/libi3.h
index c1e109ef..75d3639b 100644
--- a/include/libi3.h
+++ b/include/libi3.h
@@ -243,7 +243,7 @@ bool i3string_is_markup(i3String *str);
 /**
  * Set whether the i3String should use Pango markup.
  */
-void i3string_set_markup(i3String *str, bool is_markup);
+void i3string_set_markup(i3String *str, bool pango_markup);
 
 /**
  * Escape pango markup characters in the given string.
diff --git a/libi3/font.c b/libi3/font.c
index 9e808a89..c90f8be0 100644
--- a/libi3/font.c
+++ b/libi3/font.c
@@ -103,7 +103,7 @@ static bool load_pango_font(i3Font *font, const char *desc) {
  */
 static void draw_text_pango(const char *text, size_t text_len,
                             xcb_drawable_t drawable, xcb_visualtype_t *visual, int x, int y,
-                            int max_width, bool is_markup) {
+                            int max_width, bool pango_markup) {
     /* Create the Pango layout */
     /* root_visual_type is cached in load_pango_font */
     cairo_surface_t *surface = cairo_xcb_surface_create(conn, drawable,
@@ -117,7 +117,7 @@ static void draw_text_pango(const char *text, size_t text_len,
     pango_layout_set_wrap(layout, PANGO_WRAP_CHAR);
     pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
 
-    if (is_markup)
+    if (pango_markup)
         pango_layout_set_markup(layout, text, text_len);
     else
         pango_layout_set_text(layout, text, text_len);
@@ -143,7 +143,7 @@ static void draw_text_pango(const char *text, size_t text_len,
  * Calculate the text width using Pango rendering.
  *
  */
-static int predict_text_width_pango(const char *text, size_t text_len, bool is_markup) {
+static int predict_text_width_pango(const char *text, size_t text_len, bool pango_markup) {
     /* Create a dummy Pango layout */
     /* root_visual_type is cached in load_pango_font */
     cairo_surface_t *surface = cairo_xcb_surface_create(conn, root_screen->root, root_visual_type, 1, 1);
@@ -154,7 +154,7 @@ static int predict_text_width_pango(const char *text, size_t text_len, bool is_m
     gint width;
     pango_layout_set_font_description(layout, savedFont->specific.pango_desc);
 
-    if (is_markup)
+    if (pango_markup)
         pango_layout_set_markup(layout, text, text_len);
     else
         pango_layout_set_text(layout, text, text_len);
diff --git a/libi3/string.c b/libi3/string.c
index 7741fde0..328b41c0 100644
--- a/libi3/string.c
+++ b/libi3/string.c
@@ -24,7 +24,7 @@ struct _i3String {
     xcb_char2b_t *ucs2;
     size_t num_glyphs;
     size_t num_bytes;
-    bool is_markup;
+    bool pango_markup;
 };
 
 /*
@@ -52,7 +52,7 @@ i3String *i3string_from_markup(const char *from_markup) {
     i3String *str = i3string_from_utf8(from_markup);
 
     /* Set the markup flag */
-    str->is_markup = true;
+    str->pango_markup = true;
 
     return str;
 }
@@ -86,7 +86,7 @@ i3String *i3string_from_markup_with_length(const char *from_markup, size_t num_b
     i3String *str = i3string_from_utf8_with_length(from_markup, num_bytes);
 
     /* set the markup flag */
-    str->is_markup = true;
+    str->pango_markup = true;
 
     return str;
 }
@@ -118,7 +118,7 @@ i3String *i3string_from_ucs2(const xcb_char2b_t *from_ucs2, size_t num_glyphs) {
  */
 i3String *i3string_copy(i3String *str) {
     i3String *copy = i3string_from_utf8(i3string_as_utf8(str));
-    copy->is_markup = str->is_markup;
+    copy->pango_markup = str->pango_markup;
     return copy;
 }
 
@@ -178,14 +178,14 @@ size_t i3string_get_num_bytes(i3String *str) {
  * Whether the given i3String is in Pango markup.
  */
 bool i3string_is_markup(i3String *str) {
-    return str->is_markup;
+    return str->pango_markup;
 }
 
 /*
  * Set whether the i3String should use Pango markup.
  */
-void i3string_set_markup(i3String *str, bool is_markup) {
-    str->is_markup = is_markup;
+void i3string_set_markup(i3String *str, bool pango_markup) {
+    str->pango_markup = pango_markup;
 }
 
 /*
diff --git a/src/window.c b/src/window.c
index 5898333f..eba15632 100644
--- a/src/window.c
+++ b/src/window.c
@@ -342,7 +342,7 @@ void window_update_motif_hints(i3Window *win, xcb_get_property_reply_t *prop, bo
 i3String *window_parse_title_format(i3Window *win) {
     /* We need to ensure that we only escape the window title if pango
      * is used by the current font. */
-    const bool is_markup = font_is_pango();
+    const bool pango_markup = font_is_pango();
 
     char *format = win->title_format;
     if (format == NULL)
@@ -359,19 +359,19 @@ i3String *window_parse_title_format(i3Window *win) {
     for (char *walk = format; *walk != '\0'; walk++) {
         if (STARTS_WITH(walk, "%title")) {
             if (escaped_title == NULL)
-                escaped_title = win->name == NULL ? "" : i3string_as_utf8(is_markup ? i3string_escape_markup(win->name) : win->name);
+                escaped_title = win->name == NULL ? "" : i3string_as_utf8(pango_markup ? i3string_escape_markup(win->name) : win->name);
 
             buffer_len = buffer_len - strlen("%title") + strlen(escaped_title);
             walk += strlen("%title") - 1;
         } else if (STARTS_WITH(walk, "%class")) {
             if (escaped_class == NULL)
-                escaped_class = is_markup ? g_markup_escape_text(win->class_class, -1) : win->class_class;
+                escaped_class = pango_markup ? g_markup_escape_text(win->class_class, -1) : win->class_class;
 
             buffer_len = buffer_len - strlen("%class") + strlen(escaped_class);
             walk += strlen("%class") - 1;
         } else if (STARTS_WITH(walk, "%instance")) {
             if (escaped_instance == NULL)
-                escaped_instance = is_markup ? g_markup_escape_text(win->class_instance, -1) : win->class_instance;
+                escaped_instance = pango_markup ? g_markup_escape_text(win->class_instance, -1) : win->class_instance;
 
             buffer_len = buffer_len - strlen("%instance") + strlen(escaped_instance);
             walk += strlen("%instance") - 1;
@@ -403,6 +403,6 @@ i3String *window_parse_title_format(i3Window *win) {
     *outwalk = '\0';
 
     i3String *formatted = i3string_from_utf8(buffer);
-    i3string_set_markup(formatted, is_markup);
+    i3string_set_markup(formatted, pango_markup);
     return formatted;
 }