diff --git a/src/bgl.cc b/src/bgl.cc
index 9e1b8cdd..22a6cba8 100644
--- a/src/bgl.cc
+++ b/src/bgl.cc
@@ -13,6 +13,7 @@
 #include <list>
 #include <zlib.h>
 #include <ctype.h>
+#include <string.h>
 
 namespace Bgl {
 
diff --git a/src/bgl_babylon.cc b/src/bgl_babylon.cc
index 592cc45e..9fccd331 100644
--- a/src/bgl_babylon.cc
+++ b/src/bgl_babylon.cc
@@ -24,6 +24,7 @@
 #include "bgl_babylon.hh"
 
 #include<stdlib.h>
+#include<string.h>
 #include<stdio.h>
 #include <iconv.h>
 
diff --git a/src/btreeidx.cc b/src/btreeidx.cc
index 1109309a..d1ec7ea3 100644
--- a/src/btreeidx.cc
+++ b/src/btreeidx.cc
@@ -5,6 +5,8 @@
 #include "folding.hh"
 #include "utf8.hh"
 #include <math.h>
+#include<string.h>
+#include <stdlib.h>
 
 //#define __BTREE_USE_LZO
 // LZO mode is experimental and unsupported. Tests didn't show any substantial
diff --git a/src/chunkedstorage.cc b/src/chunkedstorage.cc
index 36a32e31..ded37255 100644
--- a/src/chunkedstorage.cc
+++ b/src/chunkedstorage.cc
@@ -3,6 +3,7 @@
 
 #include "chunkedstorage.hh"
 #include <zlib.h>
+#include<string.h>
 
 namespace ChunkedStorage {
 
diff --git a/src/iconv.cc b/src/iconv.cc
index f2a51f4b..9e7dac6c 100644
--- a/src/iconv.cc
+++ b/src/iconv.cc
@@ -4,6 +4,7 @@
 #include "iconv.hh"
 #include <vector>
 #include <errno.h>
+#include <string.h>
 
 char const * const Iconv::Wchar_t = "WCHAR_T";
 char const * const Iconv::Utf16Le = "UTF-16LE";
diff --git a/src/lsa.cc b/src/lsa.cc
index 57f0f28b..4a0a9f32 100644
--- a/src/lsa.cc
+++ b/src/lsa.cc
@@ -9,6 +9,7 @@
 #include "btreeidx.hh"
 #include <set>
 #include <vorbis/vorbisfile.h>
+#include <string.h>
 
 namespace Lsa {
 
diff --git a/src/stardict.cc b/src/stardict.cc
index af52790b..e91bf90f 100644
--- a/src/stardict.cc
+++ b/src/stardict.cc
@@ -14,6 +14,7 @@
 #include <set>
 #include <string>
 #include <arpa/inet.h>
+#include <stdlib.h>
 
 #include <QString>