diff --git a/lib/core/target.py b/lib/core/target.py
index a03a549ec..9468422f7 100644
--- a/lib/core/target.py
+++ b/lib/core/target.py
@@ -94,7 +94,7 @@ def __setRequestParams():
                 raise sqlmapUserQuitException
             elif test[0] not in ("n", "N"):
                 conf.data = re.sub(r'("[^"]+"\s*:\s*"[^"]+)"', r'\g<1>*"', conf.data)
-                conf.data = re.sub(r'("[^"]+"\s*:\s*)([\d\.]+)', r'\g<1>"\g<2>*"', conf.data)
+                conf.data = re.sub(r'("[^"]+"\s*:\s*)(-?[\d\.]+)', r'\g<1>"\g<2>*"', conf.data)
                 kb.processUserMarks = True
                 kb.postHint = POST_HINT.JSON