diff --git a/include/arch/darwin-x86/AndroidConfig.h b/include/arch/darwin-x86/AndroidConfig.h
index 2bb44c6ae..9914bd5e8 100644
--- a/include/arch/darwin-x86/AndroidConfig.h
+++ b/include/arch/darwin-x86/AndroidConfig.h
@@ -300,4 +300,12 @@
  */
 #define HAVE_PRINTF_ZD 1
 
+/*
+ * We need to open binary files using O_BINARY on Windows.
+ * Most systems lack (and actually don't need) this flag.
+ */
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #endif /*_ANDROID_CONFIG_H*/
diff --git a/include/arch/freebsd-x86/AndroidConfig.h b/include/arch/freebsd-x86/AndroidConfig.h
index 992b6895b..ed5af595e 100644
--- a/include/arch/freebsd-x86/AndroidConfig.h
+++ b/include/arch/freebsd-x86/AndroidConfig.h
@@ -358,4 +358,12 @@
  */
 #define HAVE_PRINTF_ZD 1
 
+/*
+ * We need to open binary files using O_BINARY on Windows.
+ * Most systems lack (and actually don't need) this flag.
+ */
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #endif /*_ANDROID_CONFIG_H*/
diff --git a/include/arch/linux-arm/AndroidConfig.h b/include/arch/linux-arm/AndroidConfig.h
index 5b7ccee1b..c70618d15 100644
--- a/include/arch/linux-arm/AndroidConfig.h
+++ b/include/arch/linux-arm/AndroidConfig.h
@@ -354,4 +354,12 @@
  */
 #define HAVE_PRINTF_ZD 1
 
+/*
+ * We need to open binary files using O_BINARY on Windows.
+ * Most systems lack (and actually don't need) this flag.
+ */
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #endif /* _ANDROID_CONFIG_H */
diff --git a/include/arch/linux-ppc/AndroidConfig.h b/include/arch/linux-ppc/AndroidConfig.h
index 2c443d147..91af62983 100644
--- a/include/arch/linux-ppc/AndroidConfig.h
+++ b/include/arch/linux-ppc/AndroidConfig.h
@@ -318,4 +318,12 @@
  */
 #define HAVE_PREAD 1
 
+/*
+ * We need to open binary files using O_BINARY on Windows.
+ * Most systems lack (and actually don't need) this flag.
+ */
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #endif /*_ANDROID_CONFIG_H*/
diff --git a/include/arch/linux-sh/AndroidConfig.h b/include/arch/linux-sh/AndroidConfig.h
index 0dd7b3b32..622ca50ab 100644
--- a/include/arch/linux-sh/AndroidConfig.h
+++ b/include/arch/linux-sh/AndroidConfig.h
@@ -361,4 +361,12 @@
  */
 #define HAVE_PRINTF_ZD 1
 
+/*
+ * We need to open binary files using O_BINARY on Windows.
+ * Most systems lack (and actually don't need) this flag.
+ */
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #endif /* _ANDROID_CONFIG_H */
diff --git a/include/arch/linux-x86/AndroidConfig.h b/include/arch/linux-x86/AndroidConfig.h
index 24f6cccec..26dcf1fc0 100644
--- a/include/arch/linux-x86/AndroidConfig.h
+++ b/include/arch/linux-x86/AndroidConfig.h
@@ -328,4 +328,12 @@
  */
 #define HAVE_PRINTF_ZD 1
 
+/*
+ * We need to open binary files using O_BINARY on Windows.
+ * Most systems lack (and actually don't need) this flag.
+ */
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #endif /*_ANDROID_CONFIG_H*/
diff --git a/include/arch/target_linux-x86/AndroidConfig.h b/include/arch/target_linux-x86/AndroidConfig.h
index d6ce3f222..9b357d948 100644
--- a/include/arch/target_linux-x86/AndroidConfig.h
+++ b/include/arch/target_linux-x86/AndroidConfig.h
@@ -345,4 +345,12 @@
  */
 #define HAVE_PRINTF_ZD 1
 
+/*
+ * We need to open binary files using O_BINARY on Windows.
+ * Most systems lack (and actually don't need) this flag.
+ */
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #endif /* _ANDROID_CONFIG_H */
diff --git a/include/arch/windows/AndroidConfig.h b/include/arch/windows/AndroidConfig.h
index f0bf56f78..17c84c7c5 100644
--- a/include/arch/windows/AndroidConfig.h
+++ b/include/arch/windows/AndroidConfig.h
@@ -333,4 +333,10 @@
  */
 /* #define HAVE_PRINTF_ZD 1 */
 
+/*
+ * We need to open binary files using O_BINARY on Windows.
+ * We don't define it on Windows since it is part of the io headers.
+ */
+/* #define O_BINARY 0 */
+
 #endif /*_ANDROID_CONFIG_H*/