diff --git a/pbx/Makefile b/pbx/Makefile
index 99846a23da..5cc655c0c9 100644
--- a/pbx/Makefile
+++ b/pbx/Makefile
@@ -54,10 +54,10 @@ pbx_ael.so: pbx_ael.o ael/aelbison.o ael/aelflex.o
 	$(CC) $(SOLINK) -o $@ pbx_ael.o ael/aelbison.o ael/aelflex.o
 
 ael/aelflex.o: ael/ael_lex.c ../include/asterisk/ael_structs.h ael/ael.tab.h
-	$(CC) $(CFLAGS) -c -o ael/aelflex.o ael/ael_lex.c
+	$(CC) $(CFLAGS) -I. -c -o ael/aelflex.o ael/ael_lex.c
 
 ael/aelbison.o: ael/ael.tab.c ael/ael.tab.h ../include/asterisk/ael_structs.h
-	$(CC) $(CFLAGS) -c -o ael/aelbison.o ael/ael.tab.c
+	$(CC) $(CFLAGS) -I. -c -o ael/aelbison.o ael/ael.tab.c
 
 ael/ael_lex.c: ael/ael.flex
 	(cd ael; flex ael.flex)