diff --git a/src/zm_image.cpp b/src/zm_image.cpp
index 8f91ab28b..8780facc3 100644
--- a/src/zm_image.cpp
+++ b/src/zm_image.cpp
@@ -2596,10 +2596,10 @@ void Image::Scale( unsigned int factor )
 		return;
 	}
 
-	unsigned int new_width = (width*factor)/ZM_SCALE_BASE+1;
-	unsigned int new_height = (height*factor)/ZM_SCALE_BASE+1;
+	unsigned int new_width = (width*factor)/ZM_SCALE_BASE;
+	unsigned int new_height = (height*factor)/ZM_SCALE_BASE;
 	
-	size_t scale_buffer_size = new_width * new_height * colours;
+	size_t scale_buffer_size = (new_width+1) * (new_height+1) * colours;
 	
 	uint8_t* scale_buffer = AllocBuffer(scale_buffer_size);