diff --git a/sci-chemistry/molequeue/molequeue-0.9.0-r1.ebuild b/sci-chemistry/molequeue/molequeue-0.9.0-r1.ebuild
index 8901b0f81ce5f..097499b09f3c2 100644
--- a/sci-chemistry/molequeue/molequeue-0.9.0-r1.ebuild
+++ b/sci-chemistry/molequeue/molequeue-0.9.0-r1.ebuild
@@ -53,7 +53,7 @@ src_configure() {
 			-DINSTALL_LIBRARY_DIR=$(get_libdir)
 			)
 		use zeromq && \
-			mycmakeargs+=( -DZeroMQ_ROOT_DIR=\"${EPREFIX}/usr\" )
+			mycmakeargs+=( "-DZeroMQ_ROOT_DIR=\"${EPREFIX}/usr\"" )
 
 		cmake_src_configure
 	}