diff --git a/sha/sha1.c b/sha/sha1.c
index 5d5b08b..d075db5 100644
--- a/sha/sha1.c
+++ b/sha/sha1.c
@@ -61,6 +61,22 @@
 
 #include <sha.h>
 
+/* mem_clr.c */
+unsigned static char cleanse_ctr = 0;
+static void OPENSSL_cleanse(void *ptr, size_t len)
+{
+    unsigned char *p = ptr;
+    size_t loop = len, ctr = cleanse_ctr;
+    while (loop--) {
+        *(p++) = (unsigned char)ctr;
+        ctr += (17 + ((size_t)p & 0xF));
+    }
+    p = memchr(ptr, (unsigned char)ctr, len);
+    if (p)
+        ctr += (63 + (size_t)p);
+    cleanse_ctr = (unsigned char)ctr;
+}
+
 #define DATA_ORDER_IS_BIG_ENDIAN
 
 #define SHA_1
diff --git a/sha/sha256.c b/sha/sha256.c
index 73a6355..8c477e4 100644
--- a/sha/sha256.c
+++ b/sha/sha256.c
@@ -10,8 +10,8 @@
 # include "sha.h"
 
 /* mem_clr.c */
-unsigned char cleanse_ctr = 0;
-void OPENSSL_cleanse(void *ptr, size_t len)
+unsigned static char cleanse_ctr = 0;
+static void OPENSSL_cleanse(void *ptr, size_t len)
 {
     unsigned char *p = ptr;
     size_t loop = len, ctr = cleanse_ctr;