1 files changed, 3 insertions, 3 deletions

diff --git a/libbb/trim.c b/libbb/trim.c
index be97d4924..78cf235dd 100644
--- a/libbb/trim.c
+++ b/libbb/trim.c
@@ -33,11 +33,11 @@
 
 void trim(char *s)
 {
-        int len;
+        int len=strlen(s);
 
         /* trim trailing whitespace */
-        while ( (len=strlen(s)) >= 1 && isspace(s[len-1]))
-                s[len-1]='\0';
+        while ( len > 0 && isspace(s[len-1]))
+                s[--len]='\0';
 
         /* trim leading whitespace */
         memmove(s, &s[strspn(s, " \n\r\t\v")], len);