diff --git a/src/coreclr/vm/excep.cpp b/src/coreclr/vm/excep.cpp
index 60bb20118e2b25..31e6061d6d4685 100644
--- a/src/coreclr/vm/excep.cpp
+++ b/src/coreclr/vm/excep.cpp
@@ -6188,7 +6188,12 @@ bool IsGcMarker(CONTEXT* pContext, EXCEPTION_RECORD *pExceptionRecord)
 
         if (exceptionCode == STATUS_CLR_GCCOVER_CODE)
         {
-            if (OnGcCoverageInterrupt(pContext))
+            // GCStress processing can disturb last error, so preserve it.
+            BOOL res;
+            BEGIN_PRESERVE_LAST_ERROR;
+            res = OnGcCoverageInterrupt(pContext);
+            END_PRESERVE_LAST_ERROR;
+            if (res)
             {
                 return true;
             }