diff --git a/src/gallium/state_trackers/nine/nine_shader.c b/src/gallium/state_trackers/nine/nine_shader.c
index bd373d7c321..4c58a6d4ec4 100644
--- a/src/gallium/state_trackers/nine/nine_shader.c
+++ b/src/gallium/state_trackers/nine/nine_shader.c
@@ -1898,7 +1898,7 @@ sm1_declusage_to_tgsi(struct tgsi_declaration_semantic *sem,
         sem->Index = 0;
         break;
     default:
-        unreachable(!"Invalid DECLUSAGE.");
+        unreachable("Invalid DECLUSAGE.");
         break;
     }
 }