diff --git a/tools/testing/selftests/vm/mremap_dontunmap.c b/tools/testing/selftests/vm/mremap_dontunmap.c
index 23240ee1e384c0..ee06cb0b9efbe0 100644
--- a/tools/testing/selftests/vm/mremap_dontunmap.c
+++ b/tools/testing/selftests/vm/mremap_dontunmap.c
@@ -225,7 +225,7 @@ static void mremap_dontunmap_partial_mapping()
 }
 
 // This test validates that we can remap over only a portion of a mapping.
-static void mremap_dontunmap_partial_mapping_overwrite()
+static void mremap_dontunmap_partial_mapping_overwrite(void)
 {
 	/*
 	 *  source mapping: