diff --git a/source/dub/generators/build.d b/source/dub/generators/build.d
index da7e034..c2040a4 100644
--- a/source/dub/generators/build.d
+++ b/source/dub/generators/build.d
@@ -60,6 +60,9 @@
 		foreach (ref p; buildsettings.importPaths) p = makeRelative(p);
 		foreach (ref p; buildsettings.stringImportPaths) p = makeRelative(p);
 
+		// convert plain DFLAGS to build options
+		settings.compiler.extractBuildOptions(buildsettings);
+
 		// perform the actual build
 		if (settings.rdmd) performRDMDBuild(settings, buildsettings);
 		else if (settings.direct || !generate_binary) performDirectBuild(settings, buildsettings);