diff --git a/src/glsl/glcpp/glcpp-parse.c b/src/glsl/glcpp/glcpp-parse.c
index 78dd3519511..e5d728482fa 100644
--- a/src/glsl/glcpp/glcpp-parse.c
+++ b/src/glsl/glcpp/glcpp-parse.c
@@ -3154,7 +3154,7 @@ _token_list_trim_trailing_space (token_list_t *list)
 	}
 }
 
-int
+static int
 _token_list_is_empty_ignoring_space (token_list_t *l)
 {
 	token_node_t *n;
diff --git a/src/glsl/glcpp/glcpp-parse.y b/src/glsl/glcpp/glcpp-parse.y
index bf945924b64..678676ae535 100644
--- a/src/glsl/glcpp/glcpp-parse.y
+++ b/src/glsl/glcpp/glcpp-parse.y
@@ -829,7 +829,7 @@ _token_list_trim_trailing_space (token_list_t *list)
 	}
 }
 
-int
+static int
 _token_list_is_empty_ignoring_space (token_list_t *l)
 {
 	token_node_t *n;