diff --git a/src/mod/endpoints/mod_h323/Makefile.am b/src/mod/endpoints/mod_h323/Makefile.am
index 1d724943ea..41e18c4b16 100644
--- a/src/mod/endpoints/mod_h323/Makefile.am
+++ b/src/mod/endpoints/mod_h323/Makefile.am
@@ -5,7 +5,9 @@ PTLIBDIR = `/usr/bin/ptlib-config --ptlibdir`
 
 mod_LTLIBRARIES = mod_h323.la
 mod_h323_la_SOURCES  = mod_h323.cpp
-mod_h323_la_CFLAGS   = $(AM_CFLAGS) -I$(PTLIBDIR) -I/usr/include/openh323  -I. -DPTRACING=1 -D_REENTRANT -fno-exceptions
+mod_h323_la_CFLAGS   = $(AM_CFLAGS) -fno-exceptions
+mod_h323_la_CPPFLAGS = $(AM_CPPFLAGS) -I$(PTLIBDIR) -I/usr/include/openh323  -I. -DPTRACING=1 -D_REENTRANT
+mod_h323_la_CPPFLAGS += -DPTRACING=1 -D_REENTRANT
 mod_h323_la_LIBADD   = $(switch_builddir)/libfreeswitch.la
 mod_h323_la_LDFLAGS  = -avoid-version -module -no-undefined -shared -L/usr/lib -lopenh323 -lpt -lrt