diff --git a/Makefile b/Makefile
index 81aab205ca764e7ce79b152ec69b15a6d59cf061..05855b43d2a771b2f813767af090af9ecb8497a2 100644
--- a/Makefile
+++ b/Makefile
@@ -95,9 +95,9 @@ endif
 
 LDFLAGS += -lbz2
 SOFLAGS += -lbz2
-ifneq ("$(BZIP2_INCLUDE_DIR)", "")
- CXXFLAGS += -I${BZIP2_INCLUDE_DIR}
-endif ()
+ifneq ("x$(BZIP2_INCLUDE_DIRS)", "x")
+ CXXFLAGS += -I${BZIP2_INCLUDE_DIRS}
+endif
 CXXFLAGS += -std=c++17 -I$(TABDIR)/readLib/externals/compress_stream/include