diff --git a/neo/renderer/GuiModel.cpp b/neo/renderer/GuiModel.cpp
index 5cc6b216..5db04303 100644
--- a/neo/renderer/GuiModel.cpp
+++ b/neo/renderer/GuiModel.cpp
@@ -369,6 +369,8 @@ void idGuiModel::EmitImGui( ImDrawData* drawData )
 
 	idVec2 scaleToVirtual( ( float )renderSystem->GetVirtualWidth() / sysWidth, ( float )renderSystem->GetVirtualHeight() / sysHeight );
 
+	ImGuiIO& io = ImGui::GetIO();
+
 	for( int a = 0; a < drawData->CmdListsCount; a++ )
 	{
 		const ImDrawList* cmd_list = drawData->CmdLists[a];
@@ -389,8 +391,16 @@ void idGuiModel::EmitImGui( ImDrawData* drawData )
 				mat = ( const idMaterial* )pcmd->TextureId;
 			}
 
-			// RB: (0, 0) starts in the upper left corner compared to GL!
-			idScreenRect clipRect = { static_cast<short>( pcmd->ClipRect.x ), static_cast<short>( pcmd->ClipRect.y ), static_cast<short>( pcmd->ClipRect.z ), static_cast<short>( pcmd->ClipRect.w ), 0.0f, 1.0f };
+			// RB: convert from upper left corner to bottom left (0, 0) like in GL!
+			idScreenRect clipRect =
+			{
+				static_cast<short>( pcmd->ClipRect.x ),
+				io.DisplaySize.y - static_cast<short>( pcmd->ClipRect.w ),
+				static_cast<short>( pcmd->ClipRect.z ),
+				io.DisplaySize.y - static_cast<short>( pcmd->ClipRect.y ),
+				0.0f,
+				1.0f
+			};
 
 			idDrawVert* verts = AllocTris( numVerts, indexBufferOffset, numIndexes, mat, tr.currentGLState, STEREO_DEPTH_TYPE_NONE, clipRect );
 			if( verts == NULL )
diff --git a/neo/renderer/NVRHI/RenderDebug_NVRHI.cpp b/neo/renderer/NVRHI/RenderDebug_NVRHI.cpp
index 7cd58b3e..aeb68914 100644
--- a/neo/renderer/NVRHI/RenderDebug_NVRHI.cpp
+++ b/neo/renderer/NVRHI/RenderDebug_NVRHI.cpp
@@ -92,7 +92,7 @@ void idRenderBackend::DBG_SimpleSurfaceSetup( const drawSurf_t* drawSurf )
 	if( !currentScissor.Equals( drawSurf->scissorRect ) && r_useScissor.GetBool() )
 	{
 		GL_Scissor( viewDef->viewport.x1 + drawSurf->scissorRect.x1,
-					viewDef->viewport.y1 + drawSurf->scissorRect.y1,
+					viewDef->viewport.y2 - drawSurf->scissorRect.y2,
 					drawSurf->scissorRect.x2 + 1 - drawSurf->scissorRect.x1,
 					drawSurf->scissorRect.y2 + 1 - drawSurf->scissorRect.y1 );
 
@@ -113,8 +113,9 @@ void idRenderBackend::DBG_SimpleWorldSetup()
 	RB_SetMVP( viewDef->worldSpace.mvp );
 	// RB end
 
+	// RB: (0, 0) starts in the upper left corner compared to OpenGL!
 	GL_Scissor( viewDef->viewport.x1 + viewDef->scissor.x1,
-				viewDef->viewport.y1 + viewDef->scissor.y1,
+				viewDef->viewport.y2 - viewDef->scissor.y2,
 				viewDef->scissor.x2 + 1 - viewDef->scissor.x1,
 				viewDef->scissor.y2 + 1 - viewDef->scissor.y1 );
 
@@ -433,7 +434,7 @@ void idRenderBackend::DBG_RenderDrawSurfListWithFunction( drawSurf_t** drawSurfs
 			currentScissor = drawSurf->scissorRect;
 
 			GL_Scissor( viewDef->viewport.x1 + currentScissor.x1,
-						viewDef->viewport.y1 + currentScissor.y1,
+						viewDef->viewport.y2 - currentScissor.y2,
 						currentScissor.x2 + 1 - currentScissor.x1,
 						currentScissor.y2 + 1 - currentScissor.y1 );
 		}
diff --git a/neo/renderer/RenderBackend.cpp b/neo/renderer/RenderBackend.cpp
index f70e599d..0a67615f 100644
--- a/neo/renderer/RenderBackend.cpp
+++ b/neo/renderer/RenderBackend.cpp
@@ -3976,10 +3976,9 @@ int idRenderBackend::DrawShaderPasses( const drawSurf_t* const* const drawSurfs,
 		// change the scissor if needed
 		if( !currentScissor.Equals( surf->scissorRect ) && r_useScissor.GetBool() )
 		{
-			// RB: (0, 0) starts in the upper left corner compared to GL!
-			// this is only used by the Imgui scissors which start at the top left corner
+			// RB: (0, 0) starts in the upper left corner compared to OpenGL!
 			GL_Scissor( viewDef->viewport.x1 + surf->scissorRect.x1,
-						viewDef->viewport.y1 + surf->scissorRect.y1,
+						viewDef->viewport.y2 - surf->scissorRect.y2,
 						surf->scissorRect.x2 + 1 - surf->scissorRect.x1,
 						surf->scissorRect.y2 + 1 - surf->scissorRect.y1 );