diff --git a/thirdparty/README.md b/thirdparty/README.md
index c99c2165f68..32528b11460 100644
--- a/thirdparty/README.md
+++ b/thirdparty/README.md
@@ -135,7 +135,7 @@ Files extracted from upstream source:
 ## glad
 
 - Upstream: https://github.com/Dav1dde/glad
-- Version: 0.1.31
+- Version: 0.1.33
 - License: MIT
 
 The files we package are automatically generated.
diff --git a/thirdparty/glad/glad.c b/thirdparty/glad/glad.c
index 08c9c7e2287..a1fe4d25ef2 100644
--- a/thirdparty/glad/glad.c
+++ b/thirdparty/glad/glad.c
@@ -1,6 +1,6 @@
 /*
 
-    OpenGL loader generated by glad 0.1.31 on Thu Jul 11 10:09:18 2019.
+    OpenGL loader generated by glad 0.1.33 on Tue Nov 12 08:44:22 2019.
 
     Language/Generator: C/C++
     Specification: gl
@@ -31,6 +31,9 @@
 static void* get_proc(const char *namez);
 
 #if defined(_WIN32) || defined(__CYGWIN__)
+#ifndef _WINDOWS_
+#undef APIENTRY
+#endif
 #include <windows.h>
 static HMODULE libGL;
 
diff --git a/thirdparty/glad/glad/glad.h b/thirdparty/glad/glad/glad.h
index acf96d8cd96..fae71a865e7 100644
--- a/thirdparty/glad/glad/glad.h
+++ b/thirdparty/glad/glad/glad.h
@@ -1,6 +1,6 @@
 /*
 
-    OpenGL loader generated by glad 0.1.31 on Thu Jul 11 10:09:18 2019.
+    OpenGL loader generated by glad 0.1.33 on Tue Nov 12 08:44:22 2019.
 
     Language/Generator: C/C++
     Specification: gl
@@ -3404,7 +3404,7 @@ GLAPI PFNGLWAITSYNCPROC glad_glWaitSync;
 typedef void (APIENTRYP PFNGLGETINTEGER64VPROC)(GLenum pname, GLint64 *data);
 GLAPI PFNGLGETINTEGER64VPROC glad_glGetInteger64v;
 #define glGetInteger64v glad_glGetInteger64v
-typedef void (APIENTRYP PFNGLGETSYNCIVPROC)(GLsync sync, GLenum pname, GLsizei bufSize, GLsizei *length, GLint *values);
+typedef void (APIENTRYP PFNGLGETSYNCIVPROC)(GLsync sync, GLenum pname, GLsizei count, GLsizei *length, GLint *values);
 GLAPI PFNGLGETSYNCIVPROC glad_glGetSynciv;
 #define glGetSynciv glad_glGetSynciv
 typedef void (APIENTRYP PFNGLGETINTEGER64I_VPROC)(GLenum target, GLuint index, GLint64 *data);