diff --git a/lib/core/common.py b/lib/core/common.py
index c501acd24..d1dbbc17b 100644
--- a/lib/core/common.py
+++ b/lib/core/common.py
@@ -732,9 +732,9 @@ def dataToStdout(data, forceOutput=False):
                 sys.stdout.write(data.encode(UNICODE_ENCODING))
             finally:
                 sys.stdout.flush()
-                setFormatterPrependFlag(len(data) == 1)
                 if kb.get("multiThreadMode"):
                     logging._releaseLock()
+                setFormatterPrependFlag(len(data) == 1)
 
 def dataToSessionFile(data):
     if not conf.sessionFile or kb.suppressSession:
diff --git a/lib/techniques/blind/inference.py b/lib/techniques/blind/inference.py
index eadb602ca..c625b2656 100644
--- a/lib/techniques/blind/inference.py
+++ b/lib/techniques/blind/inference.py
@@ -23,6 +23,7 @@ from lib.core.common import goGoodSamaritan
 from lib.core.common import getPartRun
 from lib.core.common import incrementCounter
 from lib.core.common import safeStringFormat
+from lib.core.common import setFormatterPrependFlag
 from lib.core.common import singleTimeWarnMessage
 from lib.core.data import conf
 from lib.core.data import kb
@@ -319,6 +320,8 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
             progress.update(index)
             progress.draw(eta)
 
+        setFormatterPrependFlag(True)
+
         # Go multi-threading (--threads > 1)
         if conf.threads > 1 and isinstance(length, int) and length > 1:
             value = []
@@ -504,6 +507,8 @@ def bisection(payload, expression, length=None, charsetType=None, firstChar=None
 
     except KeyboardInterrupt:
         abortedFlag = True
+    finally:
+        setFormatterPrependFlag(False)
 
     if conf.verbose in (1, 2) or showEta:
         dataToStdout("\n")