diff --git a/i3bar/src/child.c b/i3bar/src/child.c
index 53aef2fa..0e1280d7 100644
--- a/i3bar/src/child.c
+++ b/i3bar/src/child.c
@@ -156,7 +156,7 @@ static int stdin_start_map(void *context) {
     memset(&(ctx->block), '\0', sizeof(struct status_block));
 
     /* Default width of the separator block. */
-    ctx->block.sep_block_width = 9;
+    ctx->block.sep_block_width = logical_px(9);
 
     return 1;
 }
diff --git a/i3bar/src/xcb.c b/i3bar/src/xcb.c
index 5204d716..fd66a3f9 100644
--- a/i3bar/src/xcb.c
+++ b/i3bar/src/xcb.c
@@ -185,8 +185,8 @@ void refresh_statusline(void) {
         if (TAILQ_NEXT(block, blocks) != NULL && !block->no_separator && block->sep_block_width > 0) {
             /* This is not the last block, draw a separator. */
             uint32_t sep_offset = block->sep_block_width/2 + block->sep_block_width % 2;
-            uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND;
-            uint32_t values[] = { colors.sep_fg, colors.bar_bg };
+            uint32_t mask = XCB_GC_FOREGROUND | XCB_GC_BACKGROUND | XCB_GC_LINE_WIDTH;
+            uint32_t values[] = { colors.sep_fg, colors.bar_bg, logical_px(1) };
             xcb_change_gc(xcb_connection, statusline_ctx, mask, values);
             xcb_poly_line(xcb_connection, XCB_COORD_MODE_ORIGIN, statusline_pm,
                           statusline_ctx, 2,