diff --git a/src/glsl/nir/glsl_types.cpp b/src/glsl/nir/glsl_types.cpp
index d86609718ea..71095fa92e4 100644
--- a/src/glsl/nir/glsl_types.cpp
+++ b/src/glsl/nir/glsl_types.cpp
@@ -1055,7 +1055,7 @@ function_key_compare(const void *a, const void *b)
       return 1;
 
    return memcmp(key1->fields.parameters, key2->fields.parameters,
-                 (key1->length + 1) * sizeof(*key1->fields.parameters));
+                 (key1->length + 1) * sizeof(*key1->fields.parameters)) == 0;
 }