diff --git a/ChangeLog b/ChangeLog
index 1da6db1df1..f9ffef5ad6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jun  4 00:11:51 2012  Tanaka Akira  <akr@fsij.org>
+
+	* process.c (rb_proc_exec_e): don't use ISSPACE().  \f, \r and \v
+	  are not word separator in Bourne shell.
+
 Sun Jun  3 23:47:30 2012  Tanaka Akira  <akr@fsij.org>
 
 	* include/ruby/intern.h (rb_exec_arg): remove argc and argv fields.
diff --git a/process.c b/process.c
index 7851af164d..722756fc8c 100644
--- a/process.c
+++ b/process.c
@@ -1146,7 +1146,7 @@ rb_proc_exec_e(const char *str, VALUE envp_str)
 static int
 rb_proc_exec_e(const char *str, VALUE envp_str)
 {
-    while (*str && ISSPACE(*str))
+    while (*str == ' ' || *str == '\t' || *str == '\n')
 	str++;
 
     if (!*str) {