diff --git a/src/gpu/ganesh/ops/DrawMeshOp.cpp b/src/gpu/ganesh/ops/DrawMeshOp.cpp
index fa35a6d72a6600c87ee22ece089c4c631de78ede..f4af710a6319da9f8336fd35a4a30f31416bd5fe 100644
--- a/src/gpu/ganesh/ops/DrawMeshOp.cpp
+++ b/src/gpu/ganesh/ops/DrawMeshOp.cpp
@@ -1006,7 +1006,11 @@ GrOp::CombineResult MeshOp::onCombineIfPossible(GrOp* t, SkArenaAlloc*, const Gr
     if (SkToBool(fIndexCount) != SkToBool(that->fIndexCount)) {
         return CombineResult::kCannotCombine;
     }
-    if (SkToBool(fIndexCount) && fVertexCount > UINT16_MAX - that->fVertexCount) {
+    if (SkToBool(fIndexCount) &&
+         // Index count would overflow
+        (fIndexCount > INT32_MAX - that->fIndexCount ||
+         // *or* combined vertex count would not be referenceable by uint16 indices
+         fVertexCount > SkToInt(UINT16_MAX) - that->fVertexCount)) {
         return CombineResult::kCannotCombine;
     }