diff --git a/renderdoc/driver/d3d12/d3d12_rendermesh.cpp b/renderdoc/driver/d3d12/d3d12_rendermesh.cpp
index 906f594ab..9ce580598 100644
--- a/renderdoc/driver/d3d12/d3d12_rendermesh.cpp
+++ b/renderdoc/driver/d3d12/d3d12_rendermesh.cpp
@@ -359,7 +359,7 @@ void D3D12Replay::RenderMesh(uint32_t eventId, const std::vector<MeshFormat> &se
 
     // we source all data from the first instanced value in the instanced case, so make sure we
     // offset correctly here.
-    if(cfg.position.instanced)
+    if(cfg.position.instanced && cfg.position.instStepRate)
       offs += cfg.position.vertexByteStride * (cfg.curInstance / cfg.position.instStepRate);
 
     D3D12_VERTEX_BUFFER_VIEW view;
@@ -392,7 +392,7 @@ void D3D12Replay::RenderMesh(uint32_t eventId, const std::vector<MeshFormat> &se
 
     // we source all data from the first instanced value in the instanced case, so make sure we
     // offset correctly here.
-    if(cfg.second.instanced)
+    if(cfg.second.instanced && cfg.second.instStepRate)
       offs += cfg.second.vertexByteStride * (cfg.curInstance / cfg.second.instStepRate);
 
     D3D12_VERTEX_BUFFER_VIEW view;
diff --git a/renderdoc/driver/vulkan/vk_rendermesh.cpp b/renderdoc/driver/vulkan/vk_rendermesh.cpp
index 9cba52fee..9da7d4d78 100644
--- a/renderdoc/driver/vulkan/vk_rendermesh.cpp
+++ b/renderdoc/driver/vulkan/vk_rendermesh.cpp
@@ -550,7 +550,7 @@ void VulkanReplay::RenderMesh(uint32_t eventId, const std::vector<MeshFormat> &s
 
     // we source all data from the first instanced value in the instanced case, so make sure we
     // offset correctly here.
-    if(cfg.position.instanced)
+    if(cfg.position.instanced && cfg.position.instStepRate)
       offs += cfg.position.vertexByteStride * (cfg.curInstance / cfg.position.instStepRate);
 
     vt->CmdBindVertexBuffers(Unwrap(cmd), 0, 1, UnwrapPtr(vb), &offs);
@@ -571,7 +571,7 @@ void VulkanReplay::RenderMesh(uint32_t eventId, const std::vector<MeshFormat> &s
 
     // we source all data from the first instanced value in the instanced case, so make sure we
     // offset correctly here.
-    if(cfg.second.instanced)
+    if(cfg.second.instanced && cfg.second.instStepRate)
       offs += cfg.second.vertexByteStride * (cfg.curInstance / cfg.second.instStepRate);
 
     vt->CmdBindVertexBuffers(Unwrap(cmd), 1, 1, UnwrapPtr(vb), &offs);