diff --git a/addons/ot/include/debug.h b/addons/ot/include/debug.h
index c749960c8..667adc20b 100644
--- a/addons/ot/include/debug.h
+++ b/addons/ot/include/debug.h
@@ -35,11 +35,11 @@
 	do {                                                                               \
 		if (!(l) || (flt_ot_debug.level & (1 << (l))))                             \
 			(void)fprintf(stderr, FLT_OT_DBG_FMT("%.*s" f "\n"),               \
-			              dbg_indent_level, FLT_OT_DBG_INDENT, ##__VA_ARGS__); \
+			              flt_ot_dbg_indent_level, FLT_OT_DBG_INDENT, ##__VA_ARGS__); \
 	} while (0)
-#  define FLT_OT_FUNC(f, ...)       do { FLT_OT_DBG(1, "%s(" f ") {", __func__, ##__VA_ARGS__); dbg_indent_level += 3; } while (0)
-#  define FLT_OT_RETURN(a)          do { dbg_indent_level -= 3; FLT_OT_DBG(1, "}"); return a; } while (0)
-#  define FLT_OT_RETURN_EX(a,t,f)   do { dbg_indent_level -= 3; { t _r = (a); FLT_OT_DBG(1, "} = " f, _r); return _r; } } while (0)
+#  define FLT_OT_FUNC(f, ...)       do { FLT_OT_DBG(1, "%s(" f ") {", __func__, ##__VA_ARGS__); flt_ot_dbg_indent_level += 3; } while (0)
+#  define FLT_OT_RETURN(a)          do { flt_ot_dbg_indent_level -= 3; FLT_OT_DBG(1, "}"); return a; } while (0)
+#  define FLT_OT_RETURN_EX(a,t,f)   do { flt_ot_dbg_indent_level -= 3; { t _r = (a); FLT_OT_DBG(1, "} = " f, _r); return _r; } } while (0)
 #  define FLT_OT_RETURN_INT(a)      FLT_OT_RETURN_EX((a), int, "%d")
 #  define FLT_OT_RETURN_PTR(a)      FLT_OT_RETURN_EX((a), void *, "%p")
 #  define FLT_OT_DBG_IFDEF(a,b)     a
@@ -54,7 +54,7 @@ struct flt_ot_debug {
 };
 
 
-extern THREAD_LOCAL int    dbg_indent_level;
+extern THREAD_LOCAL int    flt_ot_dbg_indent_level;
 extern struct flt_ot_debug flt_ot_debug;
 
 #else
diff --git a/addons/ot/src/parser.c b/addons/ot/src/parser.c
index f3b4df3f1..f0ec59a55 100644
--- a/addons/ot/src/parser.c
+++ b/addons/ot/src/parser.c
@@ -22,7 +22,7 @@
 
 #ifdef DEBUG_OT
 struct flt_ot_debug               flt_ot_debug;
-THREAD_LOCAL int                  dbg_indent_level = 0;
+THREAD_LOCAL int                  flt_ot_dbg_indent_level = 0;
 #endif
 
 #ifdef OTC_DBG_MEM
diff --git a/addons/ot/src/util.c b/addons/ot/src/util.c
index fee6d377f..e572c9c64 100644
--- a/addons/ot/src/util.c
+++ b/addons/ot/src/util.c
@@ -41,7 +41,7 @@ void flt_ot_args_dump(char **args)
 
 	argc = flt_ot_args_count(args);
 
-	(void)fprintf(stderr, FLT_OT_DBG_FMT("%.*sargs[%d]: { '%s' "), dbg_indent_level, FLT_OT_DBG_INDENT, argc, args[0]);
+	(void)fprintf(stderr, FLT_OT_DBG_FMT("%.*sargs[%d]: { '%s' "), flt_ot_dbg_indent_level, FLT_OT_DBG_INDENT, argc, args[0]);
 
 	for (i = 1; i < argc; i++)
 		(void)fprintf(stderr, "'%s' ", args[i]);