diff --git a/lua/libcairo-helper.h b/lua/libcairo-helper.h
index c74965342..4eeeadfbc 100644
--- a/lua/libcairo-helper.h
+++ b/lua/libcairo-helper.h
@@ -37,7 +37,7 @@ cairo_font_extents_t *create_cairo_font_extents_t(void) {
 }
 
 cairo_matrix_t *create_cairo_matrix_t(void) {
-  return calloc(1, sizeof(cairo_matrix_t));
+  return (cairo_matrix_t *)calloc(1, sizeof(cairo_matrix_t));
 }
 
 void destroy_cairo_text_extents_t(cairo_text_extents_t *pointer) {