diff --git a/gobject/gparamspecs.c b/gobject/gparamspecs.c
index 9fa1b88c2..99bcf6085 100644
--- a/gobject/gparamspecs.c
+++ b/gobject/gparamspecs.c
@@ -37,7 +37,7 @@
 #include "gvaluearray.h"
 
 
-#define	G_FLOAT_EPSILON		(1e-30)
+#define	G_FLOAT_EPSILON		(1e-30f)
 #define	G_DOUBLE_EPSILON	(1e-90)