diff --git a/src/SLHAinterface.cc b/src/SLHAinterface.cc
index cbb0f12e8f1..c438a9f57d4 100644
--- a/src/SLHAinterface.cc
+++ b/src/SLHAinterface.cc
@@ -410,6 +410,13 @@ bool SLHAinterface::initSLHA(Settings& settings,
             "for unknown id = {" + idCode.str() + "}", true);
           continue;
         }
+        // Catch multiple re-inits of SLHA data
+        if ( mass != particleDataPtr-> m0(id) && (
+          ( particleDataPtr->hasChangedMMin(id) &&
+          particleDataPtr->mMin(id) > mass ) ||
+          ( particleDataPtr->hasChangedMMax(id) &&
+          particleDataPtr->mMax(id) < mass ) ) )
+          particleDataPtr->findParticle(id)->setHasChanged(false);
         particleDataPtr->m0(id,mass);
         idModified[id] = true;
         importMass.push_back(id);
@@ -722,7 +729,9 @@ bool SLHAinterface::initSLHA(Settings& settings,
       else {
         // mMin: lower cutoff on Breit-Wigner; see above.
         // Increase minimum if needed to ensure at least one channel on shell
-        double mMin = max(mSumMin, particlePtr->mMin());
+        double mMin1 = particlePtr->mMin();
+        double mMin0 = (mMin1 < m0 ) ? mMin1 : min(m0-0.5*wid,0.5*m0);
+        double mMin = max(mSumMin, mMin0);
         particlePtr->setMMin(mMin);
       }
     }