diff --git a/dropbear/localoptions.h b/dropbear/localoptions.h
index 0e39e35..44b5433 100644
--- a/dropbear/localoptions.h
+++ b/dropbear/localoptions.h
@@ -302,3 +302,4 @@ be overridden at runtime with -I. 0 disables idle timeouts */
 
 #define BUNDLED_LIBTOM 1
 #define DROPBEAR_ED25519 1
+#define DROPBEAR_ENABLE_GCM_MODE 1
diff --git a/jni/Android.mk b/jni/Android.mk
index 8048e68..ff0b8fc 100644
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -30,6 +30,7 @@ DROPBEAR_SRCS := $(DROPBEAR_PATH)/atomicio.c \
 	$(DROPBEAR_PATH)/ecdsa.c \
 	$(DROPBEAR_PATH)/ed25519.c \
 	$(DROPBEAR_PATH)/fake-rfc2553.c \
+	$(DROPBEAR_PATH)/gcm.c \
 	$(DROPBEAR_PATH)/gendss.c \
 	$(DROPBEAR_PATH)/gened25519.c \
 	$(DROPBEAR_PATH)/genrsa.c \