diff --git a/Makefile.am b/Makefile.am
index 76a2f31a..27d933c9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -243,8 +243,6 @@ XFAIL_TESTS = \
 	tests/hlsl-vector-indexing.shader_test \
 	tests/hlsl-vector-indexing-uniform.shader_test \
 	tests/math.shader_test \
-	tests/preproc-if-expr.shader_test \
-	tests/preproc-macro.shader_test \
 	tests/swizzle-0.shader_test \
 	tests/swizzle-1.shader_test \
 	tests/swizzle-2.shader_test \
diff --git a/libs/vkd3d-shader/preproc.y b/libs/vkd3d-shader/preproc.y
index aa381e8a..7a995430 100644
--- a/libs/vkd3d-shader/preproc.y
+++ b/libs/vkd3d-shader/preproc.y
@@ -693,6 +693,10 @@ primary_expr
             $$ = !!preproc_find_macro(ctx, $3);
             vkd3d_free($3);
         }
+    | '(' expr ')'
+        {
+            $$ = $2;
+        }
 
 unary_expr
     : primary_expr