diff --git a/src/st/st-theme-node-drawing.c b/src/st/st-theme-node-drawing.c
index 46d9de72f..5bd41c7f9 100644
--- a/src/st/st-theme-node-drawing.c
+++ b/src/st/st-theme-node-drawing.c
@@ -50,7 +50,7 @@ calculate_gaussian_kernel (gdouble   sigma,
   gdouble exp_divisor;
   gint half, i;
 
-  g_return_val_if_fail ((int) sigma > 0, NULL);
+  g_return_val_if_fail (sigma > 0, NULL);
 
   half = n_values / 2;