diff --git a/bin/sh/shell.h b/bin/sh/shell.h
index 5939df776c2..0d00a91c081 100644
--- a/bin/sh/shell.h
+++ b/bin/sh/shell.h
@@ -77,7 +77,7 @@ extern char nullstr[1];		/* null string */
 
 
 #ifdef DEBUG
-#define TRACE(param)	trace param
+#define TRACE(param)	sh_trace param
 #else
 #define TRACE(param)
 #endif
diff --git a/bin/sh/show.c b/bin/sh/show.c
index a784985bbfa..4abc4c084e9 100644
--- a/bin/sh/show.c
+++ b/bin/sh/show.c
@@ -51,6 +51,7 @@ static const char rcsid[] =
 #if DEBUG == 2
 #include <errno.h>
 #endif
+#include <errno.h>
 
 #include "shell.h"
 #include "parser.h"
@@ -304,9 +305,9 @@ trputc(c)
 
 void
 #ifdef __STDC__
-trace(const char *fmt, ...)
+sh_trace(const char *fmt, ...)
 #else
-trace(va_alist)
+sh_trace(va_alist)
 	va_dcl
 #endif
 {
diff --git a/bin/sh/show.h b/bin/sh/show.h
index 1b6cbbc2129..837d21c04ce 100644
--- a/bin/sh/show.h
+++ b/bin/sh/show.h
@@ -36,7 +36,7 @@
 
 void showtree __P((union node *));
 #ifdef DEBUG
-void trace __P((const char *, ...));
+void sh_trace __P((const char *, ...));
 void trargs __P((char **));
 void trputc __P((int));
 void trputs __P((char *));