diff --git a/crypto/o_fopen.c b/crypto/o_fopen.c
index 951d034ddaae05cc30d0d3af4aec2d01558c07be..1b4028c9a81a807e35bc8ca58f36e4718d1b2108 100644
--- a/crypto/o_fopen.c
+++ b/crypto/o_fopen.c
@@ -15,6 +15,9 @@
 # ifdef _WIN32
 #  include <windows.h>
 # endif
+# ifdef __DJGPP__
+#  include <unistd.h>
+# endif
 
 FILE *openssl_fopen(const char *filename, const char *mode)
 {
@@ -64,7 +67,7 @@ FILE *openssl_fopen(const char *filename, const char *mode)
     {
         char *newname = NULL;
 
-        if (!HAS_LFN_SUPPORT(filename)) {
+        if (pathconf(filename, _PC_NAME_MAX) <= 12) {  /* 8.3 file system? */
             char *iterator;
             char lastchar;