diff --git a/include/epoxy/egl.h b/include/epoxy/egl.h
index 7b30a04..5771ccd 100644
--- a/include/epoxy/egl.h
+++ b/include/epoxy/egl.h
@@ -27,8 +27,8 @@
  * function pointers
  */
 
-#ifndef __EPOXY_EGL_H
-#define __EPOXY_EGL_H
+#ifndef EPOXY_EGL_H
+#define EPOXY_EGL_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -52,4 +52,4 @@ int epoxy_egl_version(EGLDisplay *dpy);
 } /* extern "C" */
 #endif
 
-#endif /* __EPOXY_EGL_H */
+#endif /* EPOXY_EGL_H */
diff --git a/include/epoxy/gl.h b/include/epoxy/gl.h
index 023810c..d389076 100644
--- a/include/epoxy/gl.h
+++ b/include/epoxy/gl.h
@@ -27,8 +27,8 @@
  * global function pointers or a hidden vtable.
  */
 
-#ifndef __EPOXY_GL_H
-#define __EPOXY_GL_H
+#ifndef EPOXY_GL_H
+#define EPOXY_GL_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -85,4 +85,4 @@ int epoxy_gl_version(void);
 } /* extern "C" */
 #endif
 
-#endif /* __EPOXY_GL_H */
+#endif /* EPOXY_GL_H */
diff --git a/include/epoxy/glx.h b/include/epoxy/glx.h
index 9dc2d8f..36fc617 100644
--- a/include/epoxy/glx.h
+++ b/include/epoxy/glx.h
@@ -27,8 +27,8 @@
  * function pointers.
  */
 
-#ifndef __EPOXY_GLX_H
-#define __EPOXY_GLX_H
+#ifndef EPOXY_GLX_H
+#define EPOXY_GLX_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -55,4 +55,4 @@ int epoxy_glx_version(Display *dpy, int screen);
 } /* extern "C" */
 #endif
 
-#endif /* __EPOXY_GLX_H */
+#endif /* EPOXY_GLX_H */
diff --git a/include/epoxy/wgl.h b/include/epoxy/wgl.h
index 8d0af5a..026d052 100644
--- a/include/epoxy/wgl.h
+++ b/include/epoxy/wgl.h
@@ -27,8 +27,8 @@
  * vtable.
  */
 
-#ifndef __EPOXY_WGL_H
-#define __EPOXY_WGL_H
+#ifndef EPOXY_WGL_H
+#define EPOXY_WGL_H
 
 #ifdef __cplusplus
 extern "C" {
@@ -55,4 +55,4 @@ void epoxy_handle_external_wglMakeCurrent(void);
 } /* extern "C" */
 #endif
 
-#endif /* __EPOXY_WGL_H */
+#endif /* EPOXY_WGL_H */