diff --git a/src/compiler/nir/nir_lower_printf.c b/src/compiler/nir/nir_lower_printf.c
index fb51dae0d1b..0a2e4ff95a6 100644
--- a/src/compiler/nir/nir_lower_printf.c
+++ b/src/compiler/nir/nir_lower_printf.c
@@ -178,7 +178,7 @@ nir_printf_fmt(nir_builder *b,
       default:  unreachable("invalid");
       }
 
-      nir_def *def = va_arg(ap, nir_def*);
+      ASSERTED nir_def *def = va_arg(ap, nir_def*);
       assert(def->bit_size / 8 == arg_size);
 
       info->num_args++;