diff --git a/lib/techniques/error/use.py b/lib/techniques/error/use.py
index 86de58e4a..4ed145a55 100644
--- a/lib/techniques/error/use.py
+++ b/lib/techniques/error/use.py
@@ -320,8 +320,8 @@ def errorUse(expression, expected=None, resumeValue=True, dump=False):
 
             try:
                 threadData = getCurrentThreadData()
-                numThreads = min(conf.threads, stopLimit-startLimit)
-                threadData.shared.limits = range(startLimit, stopLimit)
+                threadData.shared.limits = range(startLimit, stopLimit+1)
+                numThreads = min(conf.threads, len(threadData.shared.limits))
                 threadData.shared.outputs = []
 
                 if stopLimit > TURN_OFF_RESUME_INFO_LIMIT:
diff --git a/lib/techniques/union/use.py b/lib/techniques/union/use.py
index c3b972668..6f9af2557 100644
--- a/lib/techniques/union/use.py
+++ b/lib/techniques/union/use.py
@@ -261,8 +261,8 @@ def unionUse(expression, unpack=True, dump=False):
 
             try:
                 threadData = getCurrentThreadData()
-                numThreads = min(conf.threads, stopLimit-startLimit)
-                threadData.shared.limits = range(startLimit, stopLimit)
+                threadData.shared.limits = range(startLimit, stopLimit+1)
+                numThreads = min(conf.threads, len(threadData.shared.limits))
                 threadData.shared.value = ""
 
                 if stopLimit > TURN_OFF_RESUME_INFO_LIMIT: