diff --git a/lldb/packages/Python/lldbsuite/test/commands/expression/import-std-module/sysroot/Makefile b/lldb/packages/Python/lldbsuite/test/commands/expression/import-std-module/sysroot/Makefile
index b6d781e7b264..c1790dfbf767 100644
--- a/lldb/packages/Python/lldbsuite/test/commands/expression/import-std-module/sysroot/Makefile
+++ b/lldb/packages/Python/lldbsuite/test/commands/expression/import-std-module/sysroot/Makefile
@@ -3,7 +3,7 @@
 # system headers.
 NO_TEST_COMMON_H := 1
 
-CXXFLAGS += -I $(SRCDIR)/root/usr/include/c++/include/ -I $(SRCDIR)/root/usr/include/ -nostdinc -nostdinc++
+CXXFLAGS_EXTRAS = -I $(SRCDIR)/root/usr/include/c++/include/ -I $(SRCDIR)/root/usr/include/ -nostdinc -nostdinc++
 CXX_SOURCES := main.cpp
 
 include Makefile.rules