diff --git a/src/osal.h b/src/osal.h
index 22bd84d3..5aabc191 100644
--- a/src/osal.h
+++ b/src/osal.h
@@ -430,7 +430,7 @@ static __inline size_t mdbx_syspagesize(void) {
 }
 
 #ifndef mdbx_strdup
-char *mdbx_strdup(const char *str);
+LIBMDBX_API char *mdbx_strdup(const char *str);
 #endif
 
 static __inline int mdbx_get_errno(void) {
diff --git a/src/tools/mdbx_chk.c b/src/tools/mdbx_chk.c
index 160b0947..6614bdb2 100644
--- a/src/tools/mdbx_chk.c
+++ b/src/tools/mdbx_chk.c
@@ -164,7 +164,7 @@ static walk_dbi_t *pagemap_lookup_dbi(const char *dbi_name, bool silent) {
       return NULL;
   }
 
-  dbi->name = strdup(dbi_name);
+  dbi->name = mdbx_strdup(dbi_name);
   if (verbose > 1 && !silent) {
     print(" - found '%s' area\n", dbi_name);
     fflush(NULL);
diff --git a/src/tools/mdbx_load.c b/src/tools/mdbx_load.c
index 661336c6..697e3e16 100644
--- a/src/tools/mdbx_load.c
+++ b/src/tools/mdbx_load.c
@@ -111,7 +111,7 @@ static void readhdr(void) {
         *ptr = '\0';
       if (subname)
         mdbx_free(subname);
-      subname = strdup((char *)dbuf.iov_base + STRLENOF("database="));
+      subname = mdbx_strdup((char *)dbuf.iov_base + STRLENOF("database="));
     } else if (!strncmp(dbuf.iov_base, "type=", STRLENOF("type="))) {
       if (strncmp((char *)dbuf.iov_base + STRLENOF("type="), "btree",
                   STRLENOF("btree"))) {
@@ -349,7 +349,7 @@ int main(int argc, char *argv[]) {
       envflags |= MDBX_NOSUBDIR;
       break;
     case 's':
-      subname = strdup(optarg);
+      subname = mdbx_strdup(optarg);
       break;
     case 'N':
       putflags = MDBX_NOOVERWRITE | MDBX_NODUPDATA;