diff --git a/timidity/mix.c b/timidity/mix.c
index 59a89169..2d63a919 100644
--- a/timidity/mix.c
+++ b/timidity/mix.c
@@ -86,7 +86,7 @@ const int32 max_amp_value = MAX_AMP_VALUE;
 #endif // DATA_T_INT32
 
 
-void mix_mystery_signal(DATA_T *sp, DATA_T *lp, int v, int count);
+static inline void mix_mystery_signal(DATA_T *sp, DATA_T *lp, int v, int count);
 void mix_voice(DATA_T *, int, int32);
 
 #if 0 // dim voice buffer
diff --git a/timidity/sysdep.h b/timidity/sysdep.h
index 4c1065b5..8d97b512 100644
--- a/timidity/sysdep.h
+++ b/timidity/sysdep.h
@@ -315,6 +315,13 @@ typedef long off_size_t;
 #    define lseek  _lseek
 typedef off_t off_size_t; /* off_t is 32-bit signed */
 #  endif /* _MSC_VER >= 1400 */
+#elif defined(__MINGW32__)
+#  include <io.h>
+#  define fseeko _fseeki64
+#  define ftello _ftelli64
+#  define lseek  _lseeki64
+typedef int64 off_size_t;
+#  define HAVE_OFF_SIZE_T_64BIT 1
 #elif defined(_LARGEFILE_SOURCE) || \
     (defined(_FILE_OFFSET_BITS) && _FILE_OFFSET_BITS == 64) || \
     (defined(_POSIX_C_SOURCE) && _POSIX_C_SOURCE >= 200112L) || \