diff --git a/src/cache/ftcimage.c b/src/cache/ftcimage.c
index 6f1534727..294c64820 100644
--- a/src/cache/ftcimage.c
+++ b/src/cache/ftcimage.c
@@ -20,6 +20,7 @@
 #include <freetype/internal/ftmemory.h>
 
 #include <string.h>     /* memcmp() */
+#include <stdlib.h>     /* labs()   */
 
 
   /* the FT_Glyph image `glyph node' type */