diff --git a/backend/common.c b/backend/common.c
index 19d8a5fd..e6bb5d95 100644
--- a/backend/common.c
+++ b/backend/common.c
@@ -32,6 +32,9 @@
 /* vim: set ts=4 sw=4 et : */
 #include <string.h>
 #include <stdio.h>
+#ifdef _MSC_VER
+#include <malloc.h>
+#endif
 #include "common.h"
 
 /* Local replacement for strlen() with unsigned char strings */
diff --git a/backend/gb18030.c b/backend/gb18030.c
index ac8b79d1..ae67fd71 100644
--- a/backend/gb18030.c
+++ b/backend/gb18030.c
@@ -53,6 +53,9 @@
  * If not, see <https://www.gnu.org/licenses/>.
  */
 #include <string.h>
+#ifdef _MSC_VER
+#include <malloc.h>
+#endif
 #include "common.h"
 #include "gb2312.h"
 #include "gb18030.h"
diff --git a/backend/gb2312.c b/backend/gb2312.c
index 276a84e0..1259f68f 100644
--- a/backend/gb2312.c
+++ b/backend/gb2312.c
@@ -53,6 +53,9 @@
  * If not, see <https://www.gnu.org/licenses/>.
  */
 #include <string.h>
+#ifdef _MSC_VER
+#include <malloc.h>
+#endif
 #include "common.h"
 #include "gb2312.h"
 
diff --git a/backend/sjis.c b/backend/sjis.c
index 908e8810..daa8aaeb 100644
--- a/backend/sjis.c
+++ b/backend/sjis.c
@@ -53,6 +53,9 @@
  * If not, see <https://www.gnu.org/licenses/>.
  */
 #include <string.h>
+#ifdef _MSC_VER
+#include <malloc.h>
+#endif
 #include "common.h"
 #include "sjis.h"