diff --git a/package/asterisk/asterisk.mk b/package/asterisk/asterisk.mk
index 65f80626be..573315ce0c 100644
--- a/package/asterisk/asterisk.mk
+++ b/package/asterisk/asterisk.mk
@@ -55,7 +55,6 @@ ASTERISK_CONF_OPTS = \
 	--without-cpg \
 	--without-curses \
 	--without-dahdi \
-	--without-gsm \
 	--without-gtk2 \
 	--without-gmime \
 	--without-h323 \
@@ -140,6 +139,13 @@ else
 ASTERISK_CONF_OPTS += --without-execinfo
 endif
 
+ifeq ($(BR2_PACKAGE_LIBGSM),y)
+ASTERISK_DEPENDENCIES += libgsm
+ASTERISK_CONF_OPTS += --with-gsm
+else
+ASTERISK_CONF_OPTS += --without-gsm
+endif
+
 ASTERISK_DIRS = \
 	ASTVARLIBDIR="/usr/lib/asterisk" \
 	ASTDATADIR="/usr/lib/asterisk" \