diff --git a/codecs/Makefile b/codecs/Makefile
index c3ab707f6d..1319167964 100644
--- a/codecs/Makefile
+++ b/codecs/Makefile
@@ -30,7 +30,7 @@ all: _all
 
 include $(ASTTOPDIR)/Makefile.moddir_rules
 
-ifneq ($(GSM_INTERNAL),)
+ifneq ($(GSM_INTERNAL),no)
 GSM_INCLUDE:=-Igsm/inc
 $(if $(filter codec_gsm,$(EMBEDDED_MODS)),modules.link,codec_gsm.so): gsm/lib/libgsm.a
 endif