diff --git a/src/mod/asr_tts/mod_cepstral/Makefile b/src/mod/asr_tts/mod_cepstral/Makefile
index 7a2ab5476a..b518708a24 100644
--- a/src/mod/asr_tts/mod_cepstral/Makefile
+++ b/src/mod/asr_tts/mod_cepstral/Makefile
@@ -1,6 +1,6 @@
 LOCAL_INSERT_LDFLAGS=if test $$osarch = "Darwin" ; then echo "-framework swift" ; else echo "-L$(SWIFT_HOME)/lib -L/opt/swift/lib -lswift -lm" ; fi ;
 
-LOCAL_INSERT_CFLAGS=test $$osarch = "Darwin" || echo "-I$(SWIFT_HOME)/include -I/opt/swift/include";
+LOCAL_INSERT_CFLAGS=if test $$osarch = "Darwin" ; then echo "-framework swift" ; else echo "-I$(SWIFT_HOME)/include -I/opt/swift/include"; fi ;
 LOCAL_CFLAGS=-w
 include ../../../../build/modmake.rules