diff --git a/src/OpenFOAM/Make/options b/src/OpenFOAM/Make/options
index 420d3469ec..c5c5809076 100644
--- a/src/OpenFOAM/Make/options
+++ b/src/OpenFOAM/Make/options
@@ -1,5 +1,5 @@
 EXE_INC = \
-    -I$(LIB_SRC)/zlib-1.2.3
+    -I$(WM_THIRD_PARTY_DIR)/zlib-1.2.3
 
 LIB_LIBS = \
     $(FOAM_LIBBIN)/libOSspecific.o \