diff --git a/tools/c_rehash.in b/tools/c_rehash.in
index 343cdc1..e48038e 100644
--- a/tools/c_rehash.in
+++ b/tools/c_rehash.in
@@ -12,7 +12,7 @@
 # and add symbolic links to their hash values.
 
 my $dir = {- quotify1($config{openssldir}) -};
-my $prefix = {- quotify1($config{prefix}) -};
+use FindBin;
 
 my $errorcount = 0;
 my $openssl = $ENV{OPENSSL} || "openssl";
@@ -61,7 +61,7 @@ if (defined(&Cwd::getcwd)) {
 
 # DOS/Win32 or Unix delimiter?  Prefix our installdir, then search.
 my $path_delim = ($pwd =~ /^[a-z]\:/i) ? ';' : ':';
-$ENV{PATH} = "$prefix/bin" . ($ENV{PATH} ? $path_delim . $ENV{PATH} : "");
+$ENV{PATH} = "$FindBin::Bin" . ($ENV{PATH} ? $path_delim . $ENV{PATH} : "");
 
 if (! -x $openssl) {
     my $found = 0;