diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 4b065dfe1e8..295ab30f24c 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -424,7 +424,7 @@ typedef struct nir_variable {
        *
        * \sa nir_variable_mode
        */
-      unsigned mode:15;
+      unsigned mode:16;
 
       /**
        * Is the variable read-only?