--- a/src/dmres.c	Wed Mar 04 00:00:11 2015 +0200
+++ b/src/dmres.c	Wed Mar 04 00:40:15 2015 +0200
@@ -172,15 +172,15 @@
 }
 
 
-static Sint64 dm_stdio_ftell(DMResource * f)
+static off_t dm_stdio_ftell(DMResource * f)
 {
-    return DM_FTELL64(f->fh);
+    return ftello(f->fh);
 }
 
 
-static int dm_stdio_fseek(DMResource *f, const Sint64 pos, const int whence)
+static int dm_stdio_fseek(DMResource *f, const off_t pos, const int whence)
 {
-    int ret = DM_FSEEK64(f->fh, pos, whence);
+    int ret = fseeko(f->fh, pos, whence);
     f->error = dmGetErrno();
     return ret;
 }
@@ -204,11 +204,15 @@
         return f->rawSize;
 
     // Get file size
-    savePos = dm_stdio_ftell(f);
+    if ((savePos = dm_stdio_ftell(f)) < 0)
+        return -1;
+
     if (dm_stdio_fseek(f, 0, SEEK_END) != 0)
         return -1;
 
-    fileSize = dm_stdio_ftell(f);
+    if ((fileSize = dm_stdio_ftell(f)) < 0)
+        return -1;
+
     if (dm_stdio_fseek(f, savePos, SEEK_SET) != 0)
         return -1;
 
@@ -449,7 +453,7 @@
     }
 
     // Seek to entry
-    if (DM_FSEEK64(handle->lib->packFile->file, node->offset, SEEK_SET) != 0)
+    if (fseeko(handle->lib->packFile->file, node->offset, SEEK_SET) != 0)
     {
         ret = dmErrorDBG(DMERR_FSEEK,
             "Could not seek node position in PACK file.\n");
@@ -537,7 +541,7 @@
 }
 
 
-static int dm_mem_fseek(DMResource * f, const Sint64 offset, const int whence)
+static int dm_mem_fseek(DMResource * f, const off_t offset, const int whence)
 {
     off_t newPos;
 
@@ -577,7 +581,7 @@
 }
 
 
-static Sint64 dm_mem_ftell(DMResource * f)
+static off_t dm_mem_ftell(DMResource * f)
 {
     return f->rawOffset;
 }
@@ -886,7 +890,7 @@
     return f->fops->ferror(f);
 }
 
-int dmfseek(DMResource * f, Sint64 offset, int whence)
+int dmfseek(DMResource * f, const off_t offset, int whence)
 {
     f->atime = time(NULL);
     return f->fops->fseek(f, offset, whence);