diff --git a/srcpkgs/gmp/template b/srcpkgs/gmp/template
index ed11873f0f..f180b9ecbf 100644
--- a/srcpkgs/gmp/template
+++ b/srcpkgs/gmp/template
@@ -34,3 +34,11 @@ Add_dependency build m4
 Add_dependency run libgcc
 Add_dependency run glibc
 Add_dependency run libstdc++
+
+post_install()
+{
+	# Required for multilib build.
+	if grep -q "\-m32" ${DESTDIR}/usr/include/gmp.h; then
+		sed -i "s|\-m32 ||g" ${DESTDIR}/usr/include/gmp.h
+	fi
+}