diff --git a/source/dub/compilers/gdc.d b/source/dub/compilers/gdc.d
index d83758c..ce7c8c5 100644
--- a/source/dub/compilers/gdc.d
+++ b/source/dub/compilers/gdc.d
@@ -67,7 +67,7 @@
 	{
 		enforceBuildRequirements(settings);
 
-		if (!fields & BuildSetting.options) {
+		if (!(fields & BuildSetting.options)) {
 			foreach (t; s_options)
 				if (settings.options & t[0])
 					settings.addDFlags(t[1]);
diff --git a/source/dub/compilers/ldc.d b/source/dub/compilers/ldc.d
index 91ef466..3a47b99 100644
--- a/source/dub/compilers/ldc.d
+++ b/source/dub/compilers/ldc.d
@@ -67,7 +67,7 @@
 	{
 		enforceBuildRequirements(settings);
 
-		if (!fields & BuildSetting.options) {
+		if (!(fields & BuildSetting.options)) {
 			foreach (t; s_options)
 				if (settings.options & t[0])
 					settings.addDFlags(t[1]);