diff --git a/interface/src/Util.h b/interface/src/Util.h
index 56bc16f5d1..ab48e0885a 100644
--- a/interface/src/Util.h
+++ b/interface/src/Util.h
@@ -38,7 +38,7 @@ float angle_to(glm::vec3 head_pos, glm::vec3 source_pos, float render_yaw, float
 float randFloat();
 void render_world_box();
 void render_vector(glm::vec3 * vec);
-int widthText(float scale, int mono, char *string);
+int widthText(float scale, int mono, char const* string);
 void drawtext(int x, int y, float scale, float rotate, float thick, int mono, 
               char const* string, float r=1.0, float g=1.0, float b=1.0);
 void drawvec3(int x, int y, float scale, float rotate, float thick, int mono, glm::vec3 vec,