diff --git a/src/Mod/Part/App/PrimitiveFeature.cpp b/src/Mod/Part/App/PrimitiveFeature.cpp
index 2e4a5cf80..26b368dc4 100644
--- a/src/Mod/Part/App/PrimitiveFeature.cpp
+++ b/src/Mod/Part/App/PrimitiveFeature.cpp
@@ -418,9 +418,9 @@ short Cone::mustExecute() const
 
 App::DocumentObjectExecReturn *Cone::execute(void)
 {
-    if (Radius1.getValue() < Precision::Confusion())
+    if (Radius1.getValue() < 0)
         return new App::DocumentObjectExecReturn("Radius of cone too small");
-    if (Radius2.getValue() < Precision::Confusion())
+    if (Radius2.getValue() < 0)
         return new App::DocumentObjectExecReturn("Radius of cone too small");
     if (Height.getValue() < Precision::Confusion())
         return new App::DocumentObjectExecReturn("Height of cone too small");