diff --git a/libi3/dpi.c b/libi3/dpi.c
index 9bb32b68..d15e35be 100644
--- a/libi3/dpi.c
+++ b/libi3/dpi.c
@@ -49,7 +49,7 @@ void init_dpi(void) {
         dpi = 0;
         goto init_dpi_end;
     }
-    dpi = (long)round(in_dpi);
+    dpi = lround(in_dpi);
 
     DLOG("Found Xft.dpi = %ld.\n", dpi);