diff --git a/src/FaacEncoder.cpp b/src/FaacEncoder.cpp
index 873c560..3f7dc75 100644
--- a/src/FaacEncoder.cpp
+++ b/src/FaacEncoder.cpp
@@ -36,7 +36,7 @@
 // compile the whole file only if faac support configured in
 #ifdef HAVE_FAAC_LIB
 
-
+#include <string.h>
 
 #include "Exception.h"
 #include "Util.h"
diff --git a/src/aacPlusEncoder.cpp b/src/aacPlusEncoder.cpp
index 70831b6..1f2ec20 100644
--- a/src/aacPlusEncoder.cpp
+++ b/src/aacPlusEncoder.cpp
@@ -36,7 +36,7 @@
 // compile the whole file only if aacplus support configured in
 #ifdef HAVE_AACPLUS_LIB
 
-
+#include <string.h>
 
 #include "Exception.h"
 #include "Util.h"