diff --git a/xpra/codecs/openh264/decoder.pyx b/xpra/codecs/openh264/decoder.pyx
index 9a8c7bad72..838083c612 100644
--- a/xpra/codecs/openh264/decoder.pyx
+++ b/xpra/codecs/openh264/decoder.pyx
@@ -190,9 +190,12 @@ cdef class Decoder:
         strides = [ystride, uvstride, uvstride]
         cdef int width = buf_info.UsrData.sSystemBuffer.iWidth
         cdef int height = buf_info.UsrData.sSystemBuffer.iHeight
-        if abs(width-self.width) > 1 or abs(height-self.height) > 1:
-            log.warn("Warning: image bigger than expected")
-            log.warn(f" {width}x{height} instead of {self.width}x{self.height}")
+        cdef int wdelta = width - self.width
+        cdef int hdelta = height - self.height
+        if abs(wdelta) > 1 or abs(hdelta) > 1:
+            if (wdelta & 0xffe0) > 0 or (hdelta & 0xfffe0) > 0:
+                log.warn("Warning: image bigger than expected")
+                log.warn(f" {width}x{height} instead of {self.width}x{self.height}")
         pixels = [
             yuv[0][:ystride*height],
             yuv[1][:uvstride*(height//2)],