diff --git a/jni/Android.mk b/jni/Android.mk
index 70fe873..e22da9f 100644
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -2,7 +2,7 @@ LOCAL_PATH := $(call my-dir)
 
 include $(CLEAR_VARS)
 
-LOCAL_CFLAGS    :=
+LOCAL_CFLAGS    := -Wall
 LOCAL_MODULE    := simplesshd-jni
 
 DROPBEAR_PATH := ../dropbear
@@ -477,7 +477,7 @@ include $(BUILD_SHARED_LIBRARY)
 
 include $(CLEAR_VARS)
 
-LOCAL_CFLAGS    :=
+LOCAL_CFLAGS    := -Wall
 LOCAL_MODULE    := scp
 
 DROPBEAR_PATH := ../dropbear
@@ -495,7 +495,7 @@ include $(BUILD_EXECUTABLE)
 
 include $(CLEAR_VARS)
 
-LOCAL_CFLAGS    :=
+LOCAL_CFLAGS    := -Wall
 LOCAL_MODULE    := sftp-server
 
 OPENSSH_PATH := ../openssh
@@ -525,7 +525,7 @@ include $(BUILD_EXECUTABLE)
 
 include $(CLEAR_VARS)
 
-LOCAL_CFLAGS    :=
+LOCAL_CFLAGS    := -Wall
 LOCAL_MODULE    := rsync
 
 RSYNC_PATH := ../rsync
@@ -603,7 +603,7 @@ include $(BUILD_EXECUTABLE)
 
 include $(CLEAR_VARS)
 
-LOCAL_CFLAGS    :=
+LOCAL_CFLAGS    := -Wall
 LOCAL_MODULE    := buffersu
 
 LOCAL_SRC_FILES := buffersu.c