diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index 6fff9b13df7..aa309d97161 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -2100,49 +2100,6 @@ set_shader_inout_layout(struct gl_shader *shader,
    shader->layer_viewport_relative = state->layer_viewport_relative;
 }
 
-/* src can be NULL if only the symbols found in the exec_list should be
- * copied
- */
-void
-_mesa_glsl_copy_symbols_from_table(struct exec_list *shader_ir,
-                                   struct glsl_symbol_table *src,
-                                   struct glsl_symbol_table *dest)
-{
-   foreach_in_list (ir_instruction, ir, shader_ir) {
-      switch (ir->ir_type) {
-      case ir_type_function:
-         dest->add_function((ir_function *) ir);
-         break;
-      case ir_type_variable: {
-         ir_variable *const var = (ir_variable *) ir;
-
-         if (var->data.mode != ir_var_temporary)
-            dest->add_variable(var);
-         break;
-      }
-      default:
-         break;
-      }
-   }
-
-   if (src != NULL) {
-      /* Explicitly copy the gl_PerVertex interface definitions because these
-       * are needed to check they are the same during the interstage link.
-       * They can’t necessarily be found via the exec_list because the members
-       * might not be referenced. The GL spec still requires that they match
-       * in that case.
-       */
-      const glsl_type *iface =
-         src->get_interface("gl_PerVertex", ir_var_shader_in);
-      if (iface)
-         dest->add_interface(glsl_get_type_name(iface), iface, ir_var_shader_in);
-
-      iface = src->get_interface("gl_PerVertex", ir_var_shader_out);
-      if (iface)
-         dest->add_interface(glsl_get_type_name(iface), iface, ir_var_shader_out);
-   }
-}
-
 extern "C" {
 
 static void
diff --git a/src/compiler/glsl/glsl_parser_extras.h b/src/compiler/glsl/glsl_parser_extras.h
index 98f5ec589bd..b355a7c510e 100644
--- a/src/compiler/glsl/glsl_parser_extras.h
+++ b/src/compiler/glsl/glsl_parser_extras.h
@@ -1096,11 +1096,6 @@ extern int glcpp_preprocess(void *ctx, const char **shader, char **info_log,
                             struct _mesa_glsl_parse_state *state,
                             struct gl_context *gl_ctx);
 
-extern void
-_mesa_glsl_copy_symbols_from_table(struct exec_list *shader_ir,
-                                   struct glsl_symbol_table *src,
-                                   struct glsl_symbol_table *dest);
-
 #ifdef __cplusplus
 }
 #endif