diff --git a/src/gui/rhi/qrhi.cpp b/src/gui/rhi/qrhi.cpp
index b9cf0a1a364..228fc91ce31 100644
--- a/src/gui/rhi/qrhi.cpp
+++ b/src/gui/rhi/qrhi.cpp
@@ -3044,9 +3044,11 @@ void QRhiImplementation::updateLayoutDesc(QRhiShaderResourceBindings *srb)
     srb->m_layoutDesc.clear();
     for (const QRhiShaderResourceBinding &b : qAsConst(srb->m_bindings)) {
         const QRhiShaderResourceBinding::Data *d = b.data();
-        // must match QRhiShaderResourceBinding::isLayoutCompatible()
-        srb->m_layoutDescHash ^= uint(d->binding) ^ uint(d->stage) ^ uint(d->type);
-        srb->m_layoutDesc << uint(d->binding) << uint(d->stage) << uint(d->type);
+        // the logic must match QRhiShaderResourceBinding::isLayoutCompatible()
+        const int count = d->type == QRhiShaderResourceBinding::SampledTexture ? d->u.stex.count : 1;
+        // the number of entries here should match LAYOUT_DESC_FIELD_COUNT
+        srb->m_layoutDescHash ^= uint(d->binding) ^ uint(d->stage) ^ uint(d->type) ^ uint(count);
+        srb->m_layoutDesc << uint(d->binding) << uint(d->stage) << uint(d->type) << uint(count);
     }
 }
 
@@ -3110,7 +3112,10 @@ void QRhiImplementation::updateLayoutDesc(QRhiShaderResourceBindings *srb)
  */
 bool QRhiShaderResourceBinding::isLayoutCompatible(const QRhiShaderResourceBinding &other) const
 {
-    return d.binding == other.d.binding && d.stage == other.d.stage && d.type == other.d.type;
+    // i.e. everything that goes into a VkDescriptorSetLayoutBinding must match
+    const int thisCount = d.type == QRhiShaderResourceBinding::SampledTexture ? d.u.stex.count : 1;
+    const int otherCount = other.d.type == QRhiShaderResourceBinding::SampledTexture ? other.d.u.stex.count : 1;
+    return d.binding == other.d.binding && d.stage == other.d.stage && d.type == other.d.type && thisCount == otherCount;
 }
 
 /*!
diff --git a/src/gui/rhi/qrhi_p.h b/src/gui/rhi/qrhi_p.h
index c2a09b7edf7..1f05b7da8a4 100644
--- a/src/gui/rhi/qrhi_p.h
+++ b/src/gui/rhi/qrhi_p.h
@@ -1040,10 +1040,12 @@ public:
     virtual bool create() = 0;
 
 protected:
+    static const int BINDING_PREALLOC = 12;
+    static const int LAYOUT_DESC_FIELD_COUNT = 4;
     QRhiShaderResourceBindings(QRhiImplementation *rhi);
-    QVarLengthArray<QRhiShaderResourceBinding, 16> m_bindings;
+    QVarLengthArray<QRhiShaderResourceBinding, BINDING_PREALLOC> m_bindings;
     uint m_layoutDescHash = 0;
-    QVarLengthArray<uint, 16 * 3> m_layoutDesc;
+    QVarLengthArray<uint, BINDING_PREALLOC * LAYOUT_DESC_FIELD_COUNT> m_layoutDesc;
     friend class QRhiImplementation;
 #ifndef QT_NO_DEBUG_STREAM
     friend Q_GUI_EXPORT QDebug operator<<(QDebug, const QRhiShaderResourceBindings &);