diff --git a/src/amd/vulkan/radv_nir_to_llvm.c b/src/amd/vulkan/radv_nir_to_llvm.c
index 900246d275e..85128ed0798 100644
--- a/src/amd/vulkan/radv_nir_to_llvm.c
+++ b/src/amd/vulkan/radv_nir_to_llvm.c
@@ -1772,6 +1772,7 @@ radv_build_param_exports(struct radv_shader_context *ctx,
 
 		if (slot_name != VARYING_SLOT_LAYER &&
 		    slot_name != VARYING_SLOT_PRIMITIVE_ID &&
+		    slot_name != VARYING_SLOT_VIEWPORT &&
 		    slot_name != VARYING_SLOT_CLIP_DIST0 &&
 		    slot_name != VARYING_SLOT_CLIP_DIST1 &&
 		    slot_name < VARYING_SLOT_VAR0)