diff --git a/dev-cpp/ms-gsl/ms-gsl-1.0.0.ebuild b/dev-cpp/ms-gsl/ms-gsl-1.0.0.ebuild
index c14435654142e..cde182b5ba10a 100644
--- a/dev-cpp/ms-gsl/ms-gsl-1.0.0.ebuild
+++ b/dev-cpp/ms-gsl/ms-gsl-1.0.0.ebuild
@@ -26,7 +26,7 @@ PATCHES=(
 src_configure() {
 	local mycmakeargs=(
 		-DGSL_TEST=$(usex test)
-		-DFORCE_SYSTEM_CATCH=ON
 	)
+	use test && mycmakeargs+=( -DFORCE_SYSTEM_CATCH=ON )
 	cmake-utils_src_configure
 }