diff --git a/src/glsl/builtin_function.cpp b/src/glsl/builtin_function.cpp
index 944265ca945..d897fa65ec5 100644
--- a/src/glsl/builtin_function.cpp
+++ b/src/glsl/builtin_function.cpp
@@ -36,6 +36,7 @@ gl_shader *
 read_builtins(GLenum target, const char *protos, const char **functions, unsigned count)
 {
    GLcontext fakeCtx;
+   fakeCtx.API = API_OPENGL;
    gl_shader *sh = _mesa_new_shader(NULL, 0, target);
    struct _mesa_glsl_parse_state *st =
       new(sh) _mesa_glsl_parse_state(&fakeCtx, target, sh);
diff --git a/src/glsl/builtins/tools/generate_builtins.py b/src/glsl/builtins/tools/generate_builtins.py
index f96a5f7b8bb..691a318c1cb 100755
--- a/src/glsl/builtins/tools/generate_builtins.py
+++ b/src/glsl/builtins/tools/generate_builtins.py
@@ -129,6 +129,7 @@ gl_shader *
 read_builtins(GLenum target, const char *protos, const char **functions, unsigned count)
 {
    GLcontext fakeCtx;
+   fakeCtx.API = API_OPENGL;
    gl_shader *sh = _mesa_new_shader(NULL, 0, target);
    struct _mesa_glsl_parse_state *st =
       new(sh) _mesa_glsl_parse_state(&fakeCtx, target, sh);