diff --git a/src/emucore/tia/frame-manager/JitterEmulation.cxx b/src/emucore/tia/frame-manager/JitterEmulation.cxx
index b31a20852..f6d2020f2 100644
--- a/src/emucore/tia/frame-manager/JitterEmulation.cxx
+++ b/src/emucore/tia/frame-manager/JitterEmulation.cxx
@@ -84,7 +84,7 @@ void JitterEmulation::frameComplete(Int32 scanlineCount, Int32 vsyncCycles)
       {
         const Int32 scanlineDifference = scanlineCount - myLastFrameScanlines;
 
-        if(abs(scanlineDifference) < myScanlineDelta
+        if(abs(scanlineDifference) >= myScanlineDelta
           && abs(myJitter) < static_cast<Int32>(myRandom.next() % myJitterLines))
         {
           // Repeated invalid frames cause randomly repeated jitter