diff --git a/libcobj/src/jp/osscons/opensourcecobol/libcobj/file/CobolFile.java b/libcobj/src/jp/osscons/opensourcecobol/libcobj/file/CobolFile.java
index 236a7ac1..b78ef712 100644
--- a/libcobj/src/jp/osscons/opensourcecobol/libcobj/file/CobolFile.java
+++ b/libcobj/src/jp/osscons/opensourcecobol/libcobj/file/CobolFile.java
@@ -688,8 +688,8 @@ public void open(int mode, int sharing, AbstractCobolField fnstatus) {
         was_not_exist = true;
         if (mode != COB_OPEN_OUTPUT
             && !this.flag_optional
-            && (mode != COB_OPEN_I_O || System.getenv(COB_IO_CREATES).equals("yes"))
-            && (mode != COB_OPEN_EXTEND || System.getenv(COB_EXTEND_CREATES).equals("yes"))) {
+            && (mode != COB_OPEN_I_O || !System.getenv(COB_IO_CREATES).equals("yes"))
+            && (mode != COB_OPEN_EXTEND || !System.getenv(COB_EXTEND_CREATES).equals("yes"))) {
           saveStatus(COB_STATUS_35_NOT_EXISTS, fnstatus);
           return;
         }