diff --git a/src/rest.cpp b/src/rest.cpp
index b340567bd1b..464880224c8 100644
--- a/src/rest.cpp
+++ b/src/rest.cpp
@@ -964,7 +964,7 @@ static bool rest_blockhash_by_height(const std::any& context, HTTPRequest* req,
 
     const auto blockheight{ToIntegral<int32_t>(height_str)};
     if (!blockheight || *blockheight < 0) {
-        return RESTERR(req, HTTP_BAD_REQUEST, "Invalid height: " + SanitizeString(height_str));
+        return RESTERR(req, HTTP_BAD_REQUEST, "Invalid height: " + SanitizeString(height_str, SAFE_CHARS_URI));
     }
 
     CBlockIndex* pblockindex = nullptr;
diff --git a/test/functional/interface_rest.py b/test/functional/interface_rest.py
index ff766978840..a853b2ec0ec 100755
--- a/test/functional/interface_rest.py
+++ b/test/functional/interface_rest.py
@@ -272,7 +272,7 @@ class RESTTest (BitcoinTestFramework):
         resp = self.test_rest_request(f"/blockhashbyheight/{INVALID_PARAM}", ret_type=RetType.OBJ, status=400)
         assert_equal(resp.read().decode('utf-8').rstrip(), f"Invalid height: {INVALID_PARAM}")
         resp = self.test_rest_request("/blockhashbyheight/+1", ret_type=RetType.OBJ, status=400)
-        assert_equal(resp.read().decode('utf-8').rstrip(), "Invalid height: 1")
+        assert_equal(resp.read().decode('utf-8').rstrip(), "Invalid height: +1")
         resp = self.test_rest_request("/blockhashbyheight/1000000", ret_type=RetType.OBJ, status=404)
         assert_equal(resp.read().decode('utf-8').rstrip(), "Block height out of range")
         resp = self.test_rest_request("/blockhashbyheight/-1", ret_type=RetType.OBJ, status=400)