1 files changed, 4 insertions, 2 deletions
diff --git a/hash.c b/hash.c
index 3ff58cc41c..62d6145148 100644
--- a/hash.c
+++ b/hash.c
@@ -1055,7 +1055,8 @@ ruby_setenv(name, value)
 	environ = tmpenv;		/* tell exec where it is now */
     }
     if (!value) {
-	free(environ[i]);
+	if (environ[i] != origenviron[i])
+	    free(environ[i]);
 	while (environ[i]) {
 	    environ[i] = environ[i+1];
 	    i++;
@@ -1067,7 +1068,8 @@ ruby_setenv(name, value)
 	environ[i+1] = 0;	/* make sure it's null terminated */
     }
     else {
-	free(environ[i]);
+	if (environ[i] != origenviron[i])
+	    free(environ[i]);
     }
     environ[i] = ALLOC_N(char, strlen(name) + strlen(value) + 2);
 #ifndef MSDOS