diff --git a/include/arch/darwin-x86/AndroidConfig.h b/include/arch/darwin-x86/AndroidConfig.h
index 6be3416ab..c8ccc7e7a 100644
--- a/include/arch/darwin-x86/AndroidConfig.h
+++ b/include/arch/darwin-x86/AndroidConfig.h
@@ -159,7 +159,7 @@
 #define _LARGEFILE_SOURCE 1
 
 /*
- * Define if off_t is always 64-bit
+ * Define if platform has off64_t (and lseek64 and other xxx64 functions)
  */
 /* #define HAVE_OFF64_T */
 
diff --git a/include/arch/freebsd-x86/AndroidConfig.h b/include/arch/freebsd-x86/AndroidConfig.h
index ad96e55e1..d828bd5f8 100644
--- a/include/arch/freebsd-x86/AndroidConfig.h
+++ b/include/arch/freebsd-x86/AndroidConfig.h
@@ -175,7 +175,7 @@
 #define _LARGEFILE_SOURCE 1
 
 /*
- * Define if off_t is always 64-bit
+ * Define if platform has off64_t (and lseek64 and other xxx64 functions)
  */
 /* #define HAVE_OFF64_T */
 
diff --git a/include/arch/linux-arm/AndroidConfig.h b/include/arch/linux-arm/AndroidConfig.h
index 48488f97d..83891cdd4 100644
--- a/include/arch/linux-arm/AndroidConfig.h
+++ b/include/arch/linux-arm/AndroidConfig.h
@@ -174,7 +174,7 @@
 /* #define _LARGEFILE_SOURCE 1 */
 
 /*
- * Define if off_t is always 64-bit
+ * Define if platform has off64_t (and lseek64 and other xxx64 functions)
  */
 #define HAVE_OFF64_T
 
diff --git a/include/arch/linux-ppc/AndroidConfig.h b/include/arch/linux-ppc/AndroidConfig.h
index 6ff50a3f8..00706dca1 100644
--- a/include/arch/linux-ppc/AndroidConfig.h
+++ b/include/arch/linux-ppc/AndroidConfig.h
@@ -164,7 +164,7 @@
 #define _LARGEFILE_SOURCE 1
 
 /*
- * Define if off_t is always 64-bit
+ * Define if platform has off64_t (and lseek64 and other xxx64 functions)
  */
 #define HAVE_OFF64_T
 
diff --git a/include/arch/linux-sh/AndroidConfig.h b/include/arch/linux-sh/AndroidConfig.h
index d389a0b58..5562eae5f 100644
--- a/include/arch/linux-sh/AndroidConfig.h
+++ b/include/arch/linux-sh/AndroidConfig.h
@@ -174,7 +174,7 @@
 /* #define _LARGEFILE_SOURCE 1 */
 
 /*
- * Define if off_t is always 64-bit
+ * Define if platform has off64_t (and lseek64 and other xxx64 functions)
  */
 #define HAVE_OFF64_T
 
diff --git a/include/arch/linux-x86/AndroidConfig.h b/include/arch/linux-x86/AndroidConfig.h
index 612c07090..7dcaa98bf 100644
--- a/include/arch/linux-x86/AndroidConfig.h
+++ b/include/arch/linux-x86/AndroidConfig.h
@@ -164,7 +164,7 @@
 #define _LARGEFILE_SOURCE 1
 
 /*
- * Define if off_t is always 64-bit
+ * Define if platform has off64_t (and lseek64 and other xxx64 functions)
  */
 #define HAVE_OFF64_T
 
diff --git a/include/arch/target_linux-x86/AndroidConfig.h b/include/arch/target_linux-x86/AndroidConfig.h
index c1a7771d6..05dd22079 100644
--- a/include/arch/target_linux-x86/AndroidConfig.h
+++ b/include/arch/target_linux-x86/AndroidConfig.h
@@ -163,7 +163,7 @@
  */
 
 /*
- * Define if off_t is always 64-bit
+ * Define if platform has off64_t (and lseek64 and other xxx64 functions)
  */
 #define HAVE_OFF64_T
 
diff --git a/include/arch/windows/AndroidConfig.h b/include/arch/windows/AndroidConfig.h
index dc7b619ad..ad890b4dd 100644
--- a/include/arch/windows/AndroidConfig.h
+++ b/include/arch/windows/AndroidConfig.h
@@ -177,9 +177,9 @@
 #define _LARGEFILE_SOURCE 1
 
 /*
- * Define if off_t is always 64-bit
+ * Define if platform has off64_t (and lseek64 and other xxx64 functions)
  */
-/* #define HAVE_OFF64_T */
+#define HAVE_OFF64_T
 
 /*
  * Defined if we have the backtrace() call for retrieving a stack trace.