diff --git a/auto/src/glew_str_glx.c b/auto/src/glew_str_glx.c
index 7c31405..8aafd69 100644
--- a/auto/src/glew_str_glx.c
+++ b/auto/src/glew_str_glx.c
@@ -7,7 +7,7 @@
 #elif !defined(__APPLE__) || defined(GLEW_APPLE_GLX)
 
 #if defined(GLEW_MX)
-GLboolean glxewContextIsSupported (GLXEWContext* ctx, const char* name)
+GLboolean glxewContextIsSupported (const GLXEWContext* ctx, const char* name)
 #else
 GLboolean glxewIsSupported (const char* name)
 #endif
diff --git a/auto/src/glew_str_head.c b/auto/src/glew_str_head.c
index 1f3ddf2..431f34c 100644
--- a/auto/src/glew_str_head.c
+++ b/auto/src/glew_str_head.c
@@ -1,5 +1,5 @@
 #ifdef GLEW_MX
-GLboolean glewContextIsSupported (GLEWContext* ctx, const char* name)
+GLboolean glewContextIsSupported (const GLEWContext* ctx, const char* name)
 #else
 GLboolean glewIsSupported (const char* name)
 #endif
diff --git a/auto/src/glew_str_wgl.c b/auto/src/glew_str_wgl.c
index 2398075..6414e45 100644
--- a/auto/src/glew_str_wgl.c
+++ b/auto/src/glew_str_wgl.c
@@ -7,7 +7,7 @@
 #if defined(_WIN32)
 
 #if defined(GLEW_MX)
-GLboolean wglewContextIsSupported (WGLEWContext* ctx, const char* name)
+GLboolean wglewContextIsSupported (const WGLEWContext* ctx, const char* name)
 #else
 GLboolean wglewIsSupported (const char* name)
 #endif
diff --git a/auto/src/glew_tail.h b/auto/src/glew_tail.h
index 647c4cf..89c5ffc 100644
--- a/auto/src/glew_tail.h
+++ b/auto/src/glew_tail.h
@@ -18,7 +18,7 @@
 
 typedef struct GLEWContextStruct GLEWContext;
 GLEWAPI GLenum glewContextInit (GLEWContext* ctx);
-GLEWAPI GLboolean glewContextIsSupported (GLEWContext* ctx, const char* name);
+GLEWAPI GLboolean glewContextIsSupported (const GLEWContext* ctx, const char* name);
 
 #define glewInit() glewContextInit(glewGetContext())
 #define glewIsSupported(x) glewContextIsSupported(glewGetContext(), x)
diff --git a/auto/src/glxew_tail.h b/auto/src/glxew_tail.h
index 702eb94..a635c56 100644
--- a/auto/src/glxew_tail.h
+++ b/auto/src/glxew_tail.h
@@ -4,7 +4,7 @@
 
 typedef struct GLXEWContextStruct GLXEWContext;
 extern GLenum glxewContextInit (GLXEWContext* ctx);
-extern GLboolean glxewContextIsSupported (GLXEWContext* ctx, const char* name);
+extern GLboolean glxewContextIsSupported (const GLXEWContext* ctx, const char* name);
 
 #define glxewInit() glxewContextInit(glxewGetContext())
 #define glxewIsSupported(x) glxewContextIsSupported(glxewGetContext(), x)
diff --git a/auto/src/wglew_tail.h b/auto/src/wglew_tail.h
index 7bb9bf8..d51b823 100644
--- a/auto/src/wglew_tail.h
+++ b/auto/src/wglew_tail.h
@@ -4,7 +4,7 @@
 
 typedef struct WGLEWContextStruct WGLEWContext;
 GLEWAPI GLenum wglewContextInit (WGLEWContext* ctx);
-GLEWAPI GLboolean wglewContextIsSupported (WGLEWContext* ctx, const char* name);
+GLEWAPI GLboolean wglewContextIsSupported (const WGLEWContext* ctx, const char* name);
 
 #define wglewInit() wglewContextInit(wglewGetContext())
 #define wglewIsSupported(x) wglewContextIsSupported(wglewGetContext(), x)