diff --git a/macosx/Base.lproj/Creator.xib b/macosx/Base.lproj/Creator.xib
index 06f316b74..52bedab33 100644
--- a/macosx/Base.lproj/Creator.xib
+++ b/macosx/Base.lproj/Creator.xib
@@ -270,7 +270,7 @@ Gw
                     </textField>
                     <stepper horizontalHuggingPriority="750" verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="bbO-nc-7cI">
                         <rect key="frame" x="672" y="81" width="19" height="28"/>
-                        <stepperCell key="cell" alignment="left" minValue="1" maxValue="1000" doubleValue="1" autorepeat="NO" id="53C-Ri-3gc"/>
+                        <stepperCell key="cell" alignment="left" minValue="14" maxValue="31" doubleValue="14" autorepeat="NO" id="53C-Ri-3gc"/>
                         <connections>
                             <action selector="incrementOrDecrementPieceSize:" target="-2" id="YDm-9R-hMY"/>
                         </connections>
diff --git a/macosx/CreatorWindowController.mm b/macosx/CreatorWindowController.mm
index 21686ddca..5554ee420 100644
--- a/macosx/CreatorWindowController.mm
+++ b/macosx/CreatorWindowController.mm
@@ -360,7 +360,7 @@ NSMutableSet* creatorWindowControllerSet = nil;
 
 - (IBAction)incrementOrDecrementPieceSize:(id)sender
 {
-    auto const piece_size = static_cast<uint32_t>(pow(2.0, [sender intValue]));
+    uint32_t const piece_size = 1U << [(NSStepper*)sender intValue];
 
     if (self.fBuilder->setPieceSize(piece_size))
     {