diff --git a/Source/NSData.m b/Source/NSData.m
index 4ab1bc394..08e328ef2 100644
--- a/Source/NSData.m
+++ b/Source/NSData.m
@@ -124,7 +124,7 @@ readContentsOfFile(NSString* path, void** buf, unsigned* len, NSZone* zone)
       NSLog(@"Open (%s) attempt failed - bad path", thePath);
       return NO;
     }
-  theFile = fopen(thePath, "r");
+  theFile = fopen(thePath, "rb");
 
   if (theFile == NULL)		/* We failed to open the file. */
     {
@@ -175,7 +175,7 @@ readContentsOfFile(NSString* path, void** buf, unsigned* len, NSZone* zone)
   c = fread(tmp, 1, fileLength, theFile);
   if (c != fileLength)
     {
-      NSLog(@"Fread of file contents failed - %s", strerror(errno));
+      NSLog(@"read of file contents failed - %s", strerror(errno));
       goto failure;
     }
 
@@ -523,7 +523,7 @@ failure:
   else
     {
       strcpy(thePath, theRealPath);
-      theFile = fopen(thePath, "w");
+      theFile = fopen(thePath, "wb");
     }
 #else
   if (useAuxiliaryFile)
@@ -545,7 +545,7 @@ failure:
     }
 
   /* Open the file (whether temp or real) for writing. */
-  theFile = fopen(thePath, "w");
+  theFile = fopen(thePath, "wb");
 #endif
 
   if (theFile == NULL)          /* Something went wrong; we weren't
diff --git a/Source/NSTimeZone.m b/Source/NSTimeZone.m
index 45cfbe98f..452f1a5dc 100644
--- a/Source/NSTimeZone.m
+++ b/Source/NSTimeZone.m
@@ -544,7 +544,7 @@ decode (const void *ptr)
 
 	 if (f)
 	   {
-	     fp = fopen([f cString], "r");
+	     fp = fopen([f cString], "rb");
 	     if (fp != NULL)
 	       {
                  if (fscanf(fp, "%79s", zone_name) == 1)
@@ -779,7 +779,7 @@ decode (const void *ptr)
   /* Read dictionary from file. */
   abbreviationDictionary = [[NSMutableDictionary alloc] init];
   fileName = [NSTimeZone getAbbreviationFile];
-  file = fopen([fileName cString], "r");
+  file = fopen([fileName cString], "rb");
   if (file == NULL)
     [NSException
       raise: NSInternalInconsistencyException
@@ -826,7 +826,7 @@ decode (const void *ptr)
     temp_array[i] = [[NSMutableArray alloc] init];
 
   fileName = [NSTimeZone getRegionsFile];
-  file = fopen([fileName cString], "r");
+  file = fopen([fileName cString], "rb");
   if (file == NULL)
     [NSException
       raise: NSInternalInconsistencyException