diff --git a/src/Makefile.am b/src/Makefile.am
index 67596e0..2a575f8 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -2,7 +2,7 @@
 
 AM_CFLAGS = -Wall -I$(top_srcdir)/include -I$(top_builddir)/include \
 	    $(OSMOCORE_CFLAGS) $(OSMOGSM_CFLAGS) $(OSMOABIS_CFLAGS) \
-	    $(PCSC_CFLAGS) \
+	    $(PCSC_CFLAGS) $(USB_CFLAGS) $(OSMOSIM_CFLAGS) \
 	    -I$(top_srcdir)/include/osmocom/rspro -DEMIT_ASN_DEBUG
 
 RSPRO_LIBVERSION=0:0:0