diff --git a/src/gui/rhi/qrhigles2.cpp b/src/gui/rhi/qrhigles2.cpp
index 8eaf02f817..33f3e0342c 100644
--- a/src/gui/rhi/qrhigles2.cpp
+++ b/src/gui/rhi/qrhigles2.cpp
@@ -3986,6 +3986,29 @@ void QRhiGles2::gatherSamplers(GLuint program,
     }
 }
 
+void QRhiGles2::sanityCheckVertexFragmentInterface(const QShaderDescription &vsDesc, const QShaderDescription &fsDesc)
+{
+    if (!vsDesc.isValid() || !fsDesc.isValid())
+        return;
+
+    // Print a warning if the fragment shader input for a given location uses a
+    // name that does not match the vertex shader output at the same location.
+    // This is not an error with any other API and not with GLSL >= 330 either,
+    // but matters for older GLSL code that has no location qualifiers.
+    for (const QShaderDescription::InOutVariable &outVar : vsDesc.outputVariables()) {
+        for (const QShaderDescription::InOutVariable &inVar : fsDesc.inputVariables()) {
+            if (inVar.location == outVar.location) {
+                if (inVar.name != outVar.name) {
+                    qWarning("Vertex output name '%s' does not match fragment input '%s'. "
+                             "This should be avoided because it causes problems with older GLSL versions.",
+                             outVar.name.constData(), inVar.name.constData());
+                }
+                break;
+            }
+        }
+    }
+}
+
 bool QRhiGles2::isProgramBinaryDiskCacheEnabled() const
 {
     static QOpenGLProgramBinarySupportCheckWrapper checker;
@@ -4886,6 +4909,8 @@ bool QGles2GraphicsPipeline::create()
         for (const QShaderDescription::InOutVariable &inVar : vsDesc.inputVariables())
             rhiD->f->glBindAttribLocation(program, GLuint(inVar.location), inVar.name);
 
+        rhiD->sanityCheckVertexFragmentInterface(vsDesc, fsDesc);
+
         if (!rhiD->linkProgram(program))
             return false;
 
diff --git a/src/gui/rhi/qrhigles2_p_p.h b/src/gui/rhi/qrhigles2_p_p.h
index 67a21f3053..3d9fba80dc 100644
--- a/src/gui/rhi/qrhigles2_p_p.h
+++ b/src/gui/rhi/qrhigles2_p_p.h
@@ -862,6 +862,7 @@ public:
                         QSet<int> *activeUniformLocations, QGles2UniformDescriptionVector *dst);
     void gatherSamplers(GLuint program, const QShaderDescription::InOutVariable &v,
                         QGles2SamplerDescriptionVector *dst);
+    void sanityCheckVertexFragmentInterface(const QShaderDescription &vsDesc, const QShaderDescription &fsDesc);
     bool isProgramBinaryDiskCacheEnabled() const;
 
     enum ProgramCacheResult {