diff --git a/sci-mathematics/z3/z3-4.3.1.ebuild b/sci-mathematics/z3/z3-4.3.1.ebuild
index e7b9bd0aa..e240ce675 100644
--- a/sci-mathematics/z3/z3-4.3.1.ebuild
+++ b/sci-mathematics/z3/z3-4.3.1.ebuild
@@ -39,7 +39,7 @@ src_prepare() {
 		-e 's:-fomit-frame-pointer::' \
 		-e 's:-msse2::g' \
 		-e 's:-msse::g' \
-		-e "/LINK_EXTRA_FLAGS/s:@LDFLAGS@:-lrt $(usex gmp -lgmp):g" \
+		-e "/LINK_EXTRA_FLAGS/s:@LDFLAGS@:-lrt $(usex gmp -lgmp ""):g" \
 		-e 's:t@\$:t\$:g' \
 		-i scripts/*mk* || die