diff --git a/lrzip.c b/lrzip.c
index dd0998a..dce63af 100644
--- a/lrzip.c
+++ b/lrzip.c
@@ -509,7 +509,8 @@ static void release_hashes(rzip_control *control)
 {
 	memset(control->salt_pass, 0, PASS_LEN);
 	memset(control->hash, 0, SALT_LEN);
-	munlockall();
+	munlock(control->salt_pass, PASS_LEN);
+	munlock(control->hash, HASH_LEN);
 	free(control->salt_pass);
 	free(control->hash);
 }
diff --git a/lrzip_private.h b/lrzip_private.h
index e04456b..492f3f8 100644
--- a/lrzip_private.h
+++ b/lrzip_private.h
@@ -90,7 +90,8 @@ typedef uint32_t u32;
 typedef struct rzip_control rzip_control;
 typedef struct md5_ctx md5_ctx;
 
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__APPLE__)
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || \
+	defined(__APPLE__) || defined(__CYGWIN__)
  #define mremap fake_mremap
 #endif