diff --git a/Makefile.libcompat b/Makefile.libcompat
index 2cbaf2e0f19..c9662346740 100644
--- a/Makefile.libcompat
+++ b/Makefile.libcompat
@@ -72,10 +72,9 @@ LIBCOMPATCFLAGS+=	${LIBCOMPATCPUFLAGS} \
 # -B is needed to find /usr/lib32/crti.o for GCC and /usr/libsoft/crti.o for
 # Clang/GCC.
 LIBCOMPATCFLAGS+=	-B${LIBCOMPATTMP}/usr/lib${libcompat}
+.if defined(X_COMPILER_TYPE) && ${X_COMPILER_TYPE} == gcc
 # GCC requires -isystem when using a cross-compiler.
 LIBCOMPATCFLAGS+=	-isystem ${LIBCOMPATTMP}/usr/include
-
-.if defined(X_COMPILER_TYPE) && ${X_COMPILER_TYPE} == gcc
 # Force using libc++ for external GCC.
 LIBCOMPATCXXFLAGS+=	-isystem ${LIBCOMPATTMP}/usr/include/c++/v1 -std=c++11 \
 			-nostdinc++ -L${LIBCOMPAT_OBJTREE}${.CURDIR}/lib/libc++