diff --git a/client_examples/Makefile.am b/client_examples/Makefile.am
index 157f561..6ffcf51 100644
--- a/client_examples/Makefile.am
+++ b/client_examples/Makefile.am
@@ -1,4 +1,4 @@
-DEFINES=-I.. -g -Wall
+AM_CFLAGS=-I.. -g -Wall
 LDADD = ../libvncclient/libvncclient.a @WSOCKLIB@
 
 if WITH_FFMPEG
diff --git a/examples/Makefile.am b/examples/Makefile.am
index 614c5ff..2a14db9 100644
--- a/examples/Makefile.am
+++ b/examples/Makefile.am
@@ -1,4 +1,4 @@
-DEFINES=-I.. -g -Wall
+AM_CFLAGS=-I.. -g -Wall
 LDADD = ../libvncserver/libvncserver.a @WSOCKLIB@
 
 if OSX
diff --git a/libvncclient/Makefile.am b/libvncclient/Makefile.am
index 32282a5..6faccd7 100644
--- a/libvncclient/Makefile.am
+++ b/libvncclient/Makefile.am
@@ -1,4 +1,4 @@
-DEFINES=-g -I.. -I. -Wall
+AM_CFLAGS=-g -I.. -I. -Wall
 
 libvncclient_a_SOURCES=cursor.c listen.c rfbproto.c sockets.c vncviewer.c
 
diff --git a/libvncserver/tightvnc-filetransfer/Makefile.am b/libvncserver/tightvnc-filetransfer/Makefile.am
index be93e5f..1f6dd44 100644
--- a/libvncserver/tightvnc-filetransfer/Makefile.am
+++ b/libvncserver/tightvnc-filetransfer/Makefile.am
@@ -1,4 +1,4 @@
-DEFINES=-g -Wall
+AM_CFLAGS=-g -Wall
 
 includedir=$(prefix)/include/rfb
 
diff --git a/test/Makefile.am b/test/Makefile.am
index e3fcdd3..e3a363e 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -1,4 +1,4 @@
-DEFINES=-I.. -g -Wall
+AM_CFLAGS=-I.. -g -Wall
 LDADD = ../libvncserver/libvncserver.a ../libvncclient/libvncclient.a @WSOCKLIB@
 
 if HAVE_LIBPTHREAD