1 files changed, 11 insertions, 5 deletions
diff --git a/src/lib/tng_io.c b/src/lib/tng_io.c
index 1459c51..7163e4c 100644
--- a/src/lib/tng_io.c
+++ b/src/lib/tng_io.c
@@ -36,13 +36,19 @@
 #include "compression/tng_compress.h"
 #include "tng/version.h"
 
-#ifdef _MSC_VER
-#define fseeko _fseeki64
-#define ftello _ftelli64
+#if defined( _WIN32 ) || defined( _WIN64 )
+    #ifndef fseeko
+        #define fseeko _fseeki64
+    #endif
+    #ifndef ftello
+        #ifdef __MINGW32__
+            #define ftello ftello64
+        #else
+            #define ftello _ftelli64
+        #endif
+    #endif
 #endif
 
-
-
 struct tng_bond {
     /** One of the atoms of the bond */
     int64_t from_atom_id;