diff --git a/jni/filters/geometry.c b/jni/filters/geometry.c
index 9fbf733..8e5e741 100644
--- a/jni/filters/geometry.c
+++ b/jni/filters/geometry.c
@@ -14,8 +14,10 @@
  * limitations under the License.
  */
 
-#include "filters.h"
 #include <stdio.h>
+#include <stdlib.h>
+
+#include "filters.h"
 
 static __inline__ void flipVertical(char * source, int srcWidth, int srcHeight, char * destination, int dstWidth, int dstHeight){
     //Vertical
diff --git a/jni/filters/highlight.c b/jni/filters/highlight.c
index 2d49e6b..f9e4665 100644
--- a/jni/filters/highlight.c
+++ b/jni/filters/highlight.c
@@ -15,6 +15,8 @@
  */
 
 #include <math.h>
+#include <stdlib.h>
+
 #include "filters.h"
 
 void JNIFUNCF(ImageFilterHighlights, nativeApplyFilter, jobject bitmap,
diff --git a/jni/filters/redEyeMath.c b/jni/filters/redEyeMath.c
index d088563..1942d69 100644
--- a/jni/filters/redEyeMath.c
+++ b/jni/filters/redEyeMath.c
@@ -15,6 +15,8 @@
  */
 
 #include <math.h>
+#include <stdlib.h>
+
 #include "filters.h"
 
 int value(int r, int g, int b) {
diff --git a/jni/filters/shadows.c b/jni/filters/shadows.c
index af3dba4..ee4621c 100644
--- a/jni/filters/shadows.c
+++ b/jni/filters/shadows.c
@@ -15,6 +15,8 @@
  */
 
 #include <math.h>
+#include <stdlib.h>
+
 #include "filters.h"
 
 void JNIFUNCF(ImageFilterShadows, nativeApplyFilter, jobject bitmap, jint width, jint height, float scale){
diff --git a/jni/filters/wbalance.c b/jni/filters/wbalance.c
index 3e1eac6..78271cd 100644
--- a/jni/filters/wbalance.c
+++ b/jni/filters/wbalance.c
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+#include <stdlib.h>
+
 #include "filters.h"
 
 void estmateWhite(unsigned char *src, int len, int *wr, int *wb, int *wg){