diff --git a/Makefile b/Makefile
index a7acd9d6..1fc40338 100644
--- a/Makefile
+++ b/Makefile
@@ -40,6 +40,7 @@ unexport AR CC CFLAGS C_INCLUDE_PATH CPATH CPLUS_INCLUDE_PATH CPP
 unexport CPPFLAGS CROSS CXX CXXCPP CXXFLAGS EXEEXT EXTRA_CFLAGS
 unexport EXTRA_LDFLAGS LD LDFLAGS LIBRARY_PATH LIBS NM
 unexport OBJC_INCLUDE_PATH PKG_CONFIG QMAKESPEC RANLIB STRIP
+unexport CONFIG_SITE
 
 SHORT_PKG_VERSION = \
     $(word 1,$(subst ., ,$($(1)_VERSION))).$(word 2,$(subst ., ,$($(1)_VERSION)))