diff --git a/src/Mod/TechDraw/TechDrawTools/TaskHoleShaftFit.py b/src/Mod/TechDraw/TechDrawTools/TaskHoleShaftFit.py
index 74b4af08bf..ff216862d1 100644
--- a/src/Mod/TechDraw/TechDrawTools/TaskHoleShaftFit.py
+++ b/src/Mod/TechDraw/TechDrawTools/TaskHoleShaftFit.py
@@ -114,7 +114,7 @@ class TaskHoleShaftFit:
         iso.calculate(value,fieldChar,quality)
         rangeValues = iso.getValues()
         mainFormat = dim.FormatSpec
-        dim.FormatSpec = mainFormat+selectedField
+        dim.FormatSpec = mainFormat+' '+selectedField
         dim.EqualTolerance = False
         dim.FormatSpecOverTolerance = '(%+.3f)'
         dim.OverTolerance = rangeValues[0]
@@ -186,4 +186,4 @@ class ISO286:
 
     def getValues(self):
         '''return range values in mm'''
-        return (self.upperValue/1000,self.lowerValue/1000)
\ No newline at end of file
+        return (self.upperValue/1000,self.lowerValue/1000)