diff --git a/public/js/crop_editor.js b/public/js/crop_editor.js
index ddfab11..e1e89e5 100644
--- a/public/js/crop_editor.js
+++ b/public/js/crop_editor.js
@@ -94,7 +94,7 @@ class CropEditor {
 		// Cropping from the centre?
 		if (cropMethod === "c") {
 			// Crop vertically from the centre, using the entire width.
-			if (sourceAspectRatio < cropAspectRatio) {
+			if (sourceAspectRatio <= cropAspectRatio) {
 				this.crop_width.value = source.naturalWidth;
 				this.crop_height.value = Math.ceil(source.naturalWidth / cropAspectRatio);
 				this.source_x.value = 0;
@@ -111,9 +111,9 @@ class CropEditor {
 		// Cropping a top or bottom slice?
 		else {
 			// Can we actually take a top or bottom slice from the original image?
-			if (sourceAspectRatio < cropAspectRatio) {
+			if (sourceAspectRatio <= cropAspectRatio) {
 				this.crop_width.value = source.naturalWidth;
-				this.crop_height.value = Math.floor(source.naturalHeight / cropAspectRatio);
+				this.crop_height.value = Math.floor(source.naturalWidth / cropAspectRatio);
 				this.source_x.value = "0";
 				this.source_y.value = cropMethod.indexOf("t") !== -1 ? "0" : source.naturalHeight - this.crop_height.value;
 			}