diff --git a/src/st/st-adjustment.c b/src/st/st-adjustment.c
index e6b33670c..45264ce4a 100644
--- a/src/st/st-adjustment.c
+++ b/src/st/st-adjustment.c
@@ -32,6 +32,7 @@
 
 #include <glib-object.h>
 #include <clutter/clutter.h>
+#include <math.h>
 
 #include "st-adjustment.h"
 #include "st-private.h"