diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 9e52710515e..4d2ff7258f0 100644
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -5844,6 +5844,7 @@ bool nir_recompute_io_bases(nir_shader *nir, nir_variable_mode modes);
 bool nir_lower_mediump_vars(nir_shader *nir, nir_variable_mode modes);
 bool nir_lower_mediump_io(nir_shader *nir, nir_variable_mode modes,
                           uint64_t varying_mask, bool use_16bit_slots);
+bool nir_clear_mediump_io_flag(nir_shader *nir);
 bool nir_force_mediump_io(nir_shader *nir, nir_variable_mode modes,
                           nir_alu_type types);
 bool nir_unpack_16bit_varying_slots(nir_shader *nir, nir_variable_mode modes);
diff --git a/src/compiler/nir/nir_lower_mediump.c b/src/compiler/nir/nir_lower_mediump.c
index 467f4fd8db5..2e2105c1c99 100644
--- a/src/compiler/nir/nir_lower_mediump.c
+++ b/src/compiler/nir/nir_lower_mediump.c
@@ -284,6 +284,36 @@ nir_lower_mediump_io(nir_shader *nir, nir_variable_mode modes,
    return nir_progress(changed, impl, nir_metadata_control_flow);
 }
 
+static bool
+clear_mediump_io_flag(struct nir_builder *b, nir_intrinsic_instr *intr, void *data)
+{
+   /* The mediump flag must be preserved for XFB, but other IO
+    * doesn't need it.
+    */
+   if (nir_intrinsic_has_io_semantics(intr) &&
+       !nir_instr_xfb_write_mask(intr)) {
+      nir_io_semantics sem = nir_intrinsic_io_semantics(intr);
+
+      if (sem.medium_precision) {
+         sem.medium_precision = 0;
+         nir_intrinsic_set_io_semantics(intr, sem);
+         return true;
+      }
+   }
+   return false;
+}
+
+/* Set nir_io_semantics.medium_precision to 0 if it has no effect.
+ *
+ * This is recommended after nir_lower_mediump_io and before
+ * nir_opt_varyings / nir_opt_vectorize_io.
+ */
+bool
+nir_clear_mediump_io_flag(nir_shader *nir)
+{
+   return nir_shader_intrinsics_pass(nir, clear_mediump_io_flag, nir_metadata_all, NULL);
+}
+
 /**
  * Set the mediump precision bit for those shader inputs and outputs that are
  * set in the "modes" mask. Non-generic varyings (that GLES3 doesn't have)