diff --git a/gl3w_gen.py b/gl3w_gen.py
index 7c5eae8..d5383db 100755
--- a/gl3w_gen.py
+++ b/gl3w_gen.py
@@ -180,7 +180,7 @@ def gather_children(node):
 
     strings = [
         '/* gl3w internal state */',
-        'union GL3WProcs {',
+        'union ImGL3WProcs {',
         '    GL3WglProc ptr[{0}];'.format(len(procs)),
         '    struct {'
     ]
@@ -188,7 +188,7 @@ def gather_children(node):
     for proc in procs:
         strings.append('        {0: <{2}} {1};'.format('PFN{0}PROC'.format(proc.upper()), proc[2:], max_proc_len))
     strings.append('    } gl;')     # struct
-    strings.append('};')            # union GL3WProcs
+    strings.append('};')            # union ImGL3WProcs
     h_template = h_template.replace(strings[0], '\n'.join(strings))
 
     strings = ['/* OpenGL functions */']
diff --git a/template/gl3w.h b/template/gl3w.h
index 033d081..cba3806 100644
--- a/template/gl3w.h
+++ b/template/gl3w.h
@@ -114,7 +114,7 @@ GL3W_API GL3WglProc imgl3wGetProcAddress(const char *proc);
 
 /* gl3w internal state */
 
-GL3W_API extern union GL3WProcs imgl3wProcs;
+GL3W_API extern union ImGL3WProcs imgl3wProcs;
 
 /* OpenGL functions */
 
@@ -258,7 +258,7 @@ GL3WglProc imgl3wGetProcAddress(const char *proc) { return get_proc(proc); }
 static const char *proc_names[] = {
 };
 
-GL3W_API union GL3WProcs imgl3wProcs;
+GL3W_API union ImGL3WProcs imgl3wProcs;
 
 static void load_procs(GL3WGetProcAddressProc proc)
 {