diff --git a/src/OpenFOAM/Make/options b/src/OpenFOAM/Make/options
index c5c5809076e0947f38c928f4ea3880b13ba60ac0..4eba86ae56d914aed88f7c06eb8d50c24b6f492b 100644
--- a/src/OpenFOAM/Make/options
+++ b/src/OpenFOAM/Make/options
@@ -1,5 +1,4 @@
-EXE_INC = \
-    -I$(WM_THIRD_PARTY_DIR)/zlib-1.2.3
+EXE_INC =
 
 LIB_LIBS = \
     $(FOAM_LIBBIN)/libOSspecific.o \
diff --git a/src/triSurface/Make/options b/src/triSurface/Make/options
index cd3f5ed69c3b97c7bd5a38c86e0a230089feb8f4..41306609f208806f0c6f42a2426867d3e10d4897 100644
--- a/src/triSurface/Make/options
+++ b/src/triSurface/Make/options
@@ -1,3 +1 @@
-EXE_INC = \
-    -I$(WM_THIRD_PARTY_DIR)/zlib-1.2.3
-
+EXE_INC =