diff --git a/include/cglm/call/vec4.h b/include/cglm/call/vec4.h
index 28a3734..f56f599 100644
--- a/include/cglm/call/vec4.h
+++ b/include/cglm/call/vec4.h
@@ -99,7 +99,7 @@ glmc_vec4_scale(vec4 v, float s, vec4 dest);
 
 CGLM_EXPORT
 void
-glmc_vec4_scale_as(vec3 v, float s, vec3 dest);
+glmc_vec4_scale_as(vec4 v, float s, vec4 dest);
 
 CGLM_EXPORT
 void