diff --git a/Makefile.tools b/Makefile.tools
index 55e769d..35412ca 100644
--- a/Makefile.tools
+++ b/Makefile.tools
@@ -38,6 +38,7 @@ monitor_btmon_SOURCES = monitor/main.c monitor/bt.h \
 				monitor/intel.h monitor/intel.c \
 				monitor/broadcom.h monitor/broadcom.c \
 				monitor/tty.h
+monitor_btmon_CPPFLAGS = $(AM_CPPFLAGS) $(UDEV_CFLAGS)
 monitor_btmon_LDADD = lib/libbluetooth-internal.la \
 				src/libshared-mainloop.la $(UDEV_LIBS)
 endif
@@ -187,6 +188,7 @@ noinst_PROGRAMS += tools/bdaddr tools/avinfo tools/avtest \
 			tools/gatt-service profiles/iap/iapd
 
 tools_bdaddr_SOURCES = tools/bdaddr.c src/oui.h src/oui.c
+tools_bdaddr_CPPFLAGS = $(AM_CPPFLAGS) $(UDEV_CFLAGS)
 tools_bdaddr_LDADD = lib/libbluetooth-internal.la $(UDEV_LIBS)
 
 tools_avinfo_LDADD = lib/libbluetooth-internal.la
@@ -336,6 +338,7 @@ tools_hciconfig_SOURCES = tools/hciconfig.c tools/csr.h tools/csr.c
 tools_hciconfig_LDADD = lib/libbluetooth-internal.la
 
 tools_hcitool_SOURCES = tools/hcitool.c src/oui.h src/oui.c
+tools_hcitool_CPPFLAGS = $(AM_CPPFLAGS) $(UDEV_CFLAGS)
 tools_hcitool_LDADD = lib/libbluetooth-internal.la $(UDEV_LIBS)
 
 tools_hcidump_SOURCES = tools/hcidump.c \
@@ -389,6 +392,7 @@ udevdir = $(UDEV_DIR)
 
 udev_PROGRAMS = tools/hid2hci
 
+tools_hid2hci_CPPFLAGS = $(AM_CPPFLAGS) $(UDEV_CFLAGS)
 tools_hid2hci_LDADD = $(UDEV_LIBS)
 
 dist_man_MANS += tools/hid2hci.1