diff --git a/gfx/gl/GLContext.h b/gfx/gl/GLContext.h
index 0de58e125e14..6ec2fec93f4d 100644
--- a/gfx/gl/GLContext.h
+++ b/gfx/gl/GLContext.h
@@ -48,8 +48,6 @@
 #include "SurfaceTypes.h"
 #include "GLScreenBuffer.h"
 
-typedef char realGLboolean;
-
 #include "GLContextSymbols.h"
 
 #include "mozilla/mozalloc.h"
diff --git a/gfx/gl/GLTypes.h b/gfx/gl/GLTypes.h
index 866f041626db..8044370ea4d5 100644
--- a/gfx/gl/GLTypes.h
+++ b/gfx/gl/GLTypes.h
@@ -12,16 +12,16 @@
 #include <stddef.h>
 #include <stdint.h>
 
-typedef unsigned int GLenum;
-typedef unsigned int GLbitfield;
-typedef unsigned int GLuint;
-typedef int GLint;
-typedef int GLsizei;
-typedef char realGLboolean;
-typedef signed char GLbyte;
-typedef short GLshort;
-typedef unsigned char GLubyte;
-typedef unsigned short GLushort;
+typedef uint32_t GLenum;
+typedef uint32_t GLbitfield;
+typedef uint32_t GLuint;
+typedef int32_t GLint;
+typedef int32_t GLsizei;
+typedef int8_t realGLboolean;
+typedef int8_t GLbyte;
+typedef int16_t GLshort;
+typedef uint8_t GLubyte;
+typedef uint16_t GLushort;
 typedef float GLfloat;
 typedef float GLclampf;
 #ifndef GLdouble_defined