1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bio/bss_file.c b/src/lib/libcrypto/bio/bss_file.c
index 826b361fa2..a66600c1a3 100644
--- a/src/lib/libcrypto/bio/bss_file.c
+++ b/src/lib/libcrypto/bio/bss_file.c
@@ -247,7 +247,7 @@ static long MS_CALLBACK file_ctrl(BIO *b, int cmd, long num, void *ptr)
                         ret=0;
                         break;
                         }
-#if defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_WINDOWS)
+#if defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_OS2)
                 if (!(num & BIO_FP_TEXT))
                         strcat(p,"b");
                 else