diff --git a/MBProgressHUD.m b/MBProgressHUD.m
index ffb6ba1..271747f 100644
--- a/MBProgressHUD.m
+++ b/MBProgressHUD.m
@@ -381,7 +381,7 @@ static const CGFloat MBDefaultDetailsLabelFontSize = 12.f;
     [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"|-(>=margin)-[bezel]-(>=margin)-|" options:0 metrics:metrics views:NSDictionaryOfVariableBindings(bezel)]];
     [self addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(>=margin)-[bezel]-(>=margin)-|" options:0 metrics:metrics views:NSDictionaryOfVariableBindings(bezel)]];
 
-    // Extenra bezel constraints
+    // Minimum bezel size, if set
     CGSize minimumSize = self.minSize;
     if (!CGSizeEqualToSize(minimumSize, CGSizeZero)) {
         NSLayoutConstraint *width = [NSLayoutConstraint constraintWithItem:bezel attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.f constant:minimumSize.width];
@@ -391,6 +391,13 @@ static const CGFloat MBDefaultDetailsLabelFontSize = 12.f;
         [bezel addConstraints:@[width, height]];
     }
 
+    // Square aspect ratio, if set
+    if (self.square) {
+        NSLayoutConstraint *square = [NSLayoutConstraint constraintWithItem:bezel attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:bezel attribute:NSLayoutAttributeWidth multiplier:1.f constant:0];
+        square.priority = 998.f;
+        [bezel addConstraint:square];
+    }
+
     // Top and bottom spacing
     UIView *topSpacer = self.topSpacer;
     [topSpacer addConstraint:[NSLayoutConstraint constraintWithItem:topSpacer attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.f constant:margin]];