diff --git a/GL/matrix.c b/GL/matrix.c
index bfa2f12..2744cb9 100644
--- a/GL/matrix.c
+++ b/GL/matrix.c
@@ -174,8 +174,8 @@ void APIENTRY glRotatef(GLfloat angle, GLfloat x, GLfloat  y, GLfloat z) {
     };
 
     float r = DEG2RAD * angle;
-    float c = fcos(r);
-    float s = fsin(r);
+    float c = cosf(r);
+    float s = sinf(r);
 
     VEC3_NORMALIZE(x, y, z);