diff --git a/Makefile b/Makefile
index b394fd54fa..87943b8ed4 100644
--- a/Makefile
+++ b/Makefile
@@ -172,6 +172,7 @@ export HOSTCC_NOCCACHE HOSTCXX_NOCCACHE
 
 # Make sure pkg-config doesn't look outside the buildroot tree
 unexport PKG_CONFIG_PATH
+unexport PKG_CONFIG_SYSROOT_DIR
 
 # Having DESTDIR set in the environment confuses the installation
 # steps of some packages.