diff --git a/src/Gui/SoFCOffscreenRenderer.cpp b/src/Gui/SoFCOffscreenRenderer.cpp
index 5f88ee57fe..8232bcc1de 100644
--- a/src/Gui/SoFCOffscreenRenderer.cpp
+++ b/src/Gui/SoFCOffscreenRenderer.cpp
@@ -589,6 +589,8 @@ SoQtOffscreenRenderer::makeFrameBuffer(int width, int height, int samples)
     fmt.setAttachment(QtGLFramebufferObject::Depth);
 #if defined(HAVE_QT5_OPENGL)
     fmt.setInternalTextureFormat(GL_RGB32F_ARB);
+#else
+    fmt.setInternalTextureFormat(GL_RGB);
 #endif
 #else
     QtGLFramebufferObject::Attachment fmt;
diff --git a/src/Gui/Thumbnail.cpp b/src/Gui/Thumbnail.cpp
index 7b038ee590..3626dd8ff5 100644
--- a/src/Gui/Thumbnail.cpp
+++ b/src/Gui/Thumbnail.cpp
@@ -136,14 +136,15 @@ void Thumbnail::createThumbnailFromFramebuffer(QImage& img) const
     // Alternative way of off-screen rendering
     if (this->viewer->isActiveWindow()) {
         static_cast<QtGLWidget*>(this->viewer->getGLWidget())->makeCurrent();
-#if defined(HAVE_QT5_OPENGL)
+
         QtGLFramebufferObjectFormat format;
         format.setAttachment(QtGLFramebufferObject::Depth);
+#if defined(HAVE_QT5_OPENGL)
         format.setInternalTextureFormat(GL_RGB32F_ARB);
-        QtGLFramebufferObject fbo(this->size, this->size, format);
 #else
-        QtGLFramebufferObject fbo(this->size, this->size, QtGLFramebufferObject::Depth);
+        format.setInternalTextureFormat(GL_RGB);
 #endif
+        QtGLFramebufferObject fbo(this->size, this->size, format);
         this->viewer->renderToFramebuffer(&fbo);
         img = fbo.toImage();
         static_cast<QtGLWidget*>(this->viewer->getGLWidget())->doneCurrent();
diff --git a/src/Gui/View3DInventor.cpp b/src/Gui/View3DInventor.cpp
index 16b974a350..71a7c4f665 100644
--- a/src/Gui/View3DInventor.cpp
+++ b/src/Gui/View3DInventor.cpp
@@ -588,6 +588,8 @@ void View3DInventor::previewFromFramebuffer(const QRect& rect, QImage& img)
     format.setAttachment(QtGLFramebufferObject::Depth);
 #if defined(HAVE_QT5_OPENGL)
     format.setInternalTextureFormat(GL_RGB32F_ARB);
+#else
+    format.setInternalTextureFormat(GL_RGB);
 #endif
     QtGLFramebufferObject fbo(rect.width(), rect.height(), format);
 #else
diff --git a/src/Gui/View3DPy.cpp b/src/Gui/View3DPy.cpp
index 057371fbfc..f10ebffe93 100644
--- a/src/Gui/View3DPy.cpp
+++ b/src/Gui/View3DPy.cpp
@@ -710,6 +710,8 @@ void View3DInventorPy::createImageFromFramebuffer(int width, int height, const Q
     format.setAttachment(QtGLFramebufferObject::Depth);
 #if defined(HAVE_QT5_OPENGL)
     format.setInternalTextureFormat(GL_RGB32F_ARB);
+#else
+    format.setInternalTextureFormat(GL_RGB);
 #endif
     QtGLFramebufferObject fbo(width, height, format);
 #else