diff --git a/src/nouveau/mme/mme_fermi_builder.c b/src/nouveau/mme/mme_fermi_builder.c
index 2a0a77eb3e8..5d58ca5e771 100644
--- a/src/nouveau/mme/mme_fermi_builder.c
+++ b/src/nouveau/mme/mme_fermi_builder.c
@@ -200,7 +200,7 @@ mme_fermi_reg(uint32_t reg)
 static bool
 is_int18(uint32_t i)
 {
-   return i == util_mask_sign_extend(i, 18);
+   return i == (uint32_t)util_mask_sign_extend(i, 18);
 }
 
 static inline void