diff --git a/Changes b/Changes
index 8ceb6a8..a79a71a 100644
--- a/Changes
+++ b/Changes
@@ -5,6 +5,7 @@ $Id$
 Fri, May 20 2016 JoungKyun.Kim <http://oops.org>
 	- remove --with-mysql-plugins-dir option
 	- add --with-mysql-config option
+	- fixed compile warning on gcc 4.8 (#3)
 
 Thu, May 19 2016 JoungKyun.Kim <http://oops.org>
 	- fixed HAVE_LOG2 redefining warning on mariadb 10.1
diff --git a/src/my_aes.c b/src/my_aes.c
index 50eaadf..ec808f1 100644
--- a/src/my_aes.c
+++ b/src/my_aes.c
@@ -254,7 +254,7 @@ int my_aes256_decrypt(const char *source, int source_length, char *dest,
    Size of buffer required to store encrypted data
 */
 
-int my_aes256_get_size(int source_length)
+unsigned long my_aes256_get_size(int source_length)
 {
   DEBUG_SUB_FUNCTION_IN;
   DEBUG_SUB_FUNCTION_OUT;
diff --git a/src/my_aes.h b/src/my_aes.h
index 2006b70..d61c1e6 100644
--- a/src/my_aes.h
+++ b/src/my_aes.h
@@ -64,7 +64,7 @@ int my_aes256_decrypt(const char *source, int source_length, char *dest,
   returns  - size of buffer required to store encrypted data
 */
 
-int my_aes256_get_size(int source_length);
+unsigned long my_aes256_get_size(int source_length);
 
 C_MODE_END
 
diff --git a/src/mysql_aes256.c b/src/mysql_aes256.c
index eb35fc7..930d4a5 100644
--- a/src/mysql_aes256.c
+++ b/src/mysql_aes256.c
@@ -61,6 +61,7 @@ extern "C" {
 
 #include <mysql_aes256_config.h>
 #include <mysql_aes256.h>
+#include <my_aes.h>
 
 #ifdef HAVE_DLOPEN
 
@@ -201,7 +202,7 @@ EXPORT_API char * aes256_encrypt (
 EXPORT_API my_bool aes256_decrypt_init (UDF_INIT * initid, UDF_ARGS * args, char * message)
 {
 	DEBUG_FUNCTION_IN;
-	int blocks, i;
+	int i;
 
 	if ( args->arg_count != 2 ) {
 		sprintf (
@@ -226,7 +227,7 @@ EXPORT_API my_bool aes256_decrypt_init (UDF_INIT * initid, UDF_ARGS * args, char
 				"  - %dst Argument:\n"
 				"    - type   : %d\n"
 				"    - data   : %s\n"
-				"    - length : %d\n",
+				"    - length : %ld\n",
 				i + 1, args->arg_type[i], args->args[i], args->lengths[i]
 			);
 
@@ -252,7 +253,7 @@ EXPORT_API my_bool aes256_decrypt_init (UDF_INIT * initid, UDF_ARGS * args, char
 	if ( (args->lengths[0] / AES256_BLOCK_SIZE) == 0 ) {
 		sprintf (
 			message,
-			"CIPHERTEXT(%d) is longer than AES BLOCKSIZE(%d) (udf: %s)",
+			"CIPHERTEXT(%ld) is longer than AES BLOCKSIZE(%d) (udf: %s)",
 			args->lengths[0], AES256_BLOCK_SIZE, __FUNCTION__
 		);
 		return false;
@@ -294,7 +295,7 @@ EXPORT_API char * aes256_decrypt (
 			"  - 1st Argument:\n"
 			"    + type   : %d\n"
 			"    + data   : %s\n"
-			"    + length : %d\n",
+			"    + length : %ld\n",
 			args->arg_type[0], args->args[0], args->lengths[0]
 		);
 	}