diff --git a/include/arch/darwin-x86/AndroidConfig.h b/include/arch/darwin-x86/AndroidConfig.h
index c8ccc7e7a..d99072a7a 100644
--- a/include/arch/darwin-x86/AndroidConfig.h
+++ b/include/arch/darwin-x86/AndroidConfig.h
@@ -305,4 +305,12 @@
  */
 #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 d828bd5f8..9703c766e 100644
--- a/include/arch/freebsd-x86/AndroidConfig.h
+++ b/include/arch/freebsd-x86/AndroidConfig.h
@@ -363,4 +363,12 @@
  */
 #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 83891cdd4..5138d9054 100644
--- a/include/arch/linux-arm/AndroidConfig.h
+++ b/include/arch/linux-arm/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-ppc/AndroidConfig.h b/include/arch/linux-ppc/AndroidConfig.h
index 00706dca1..60bddd62d 100644
--- a/include/arch/linux-ppc/AndroidConfig.h
+++ b/include/arch/linux-ppc/AndroidConfig.h
@@ -323,4 +323,12 @@
  */
 #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 5562eae5f..9303bb662 100644
--- a/include/arch/linux-sh/AndroidConfig.h
+++ b/include/arch/linux-sh/AndroidConfig.h
@@ -366,4 +366,12 @@
  */
 #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 7dcaa98bf..6fd26eac4 100644
--- a/include/arch/linux-x86/AndroidConfig.h
+++ b/include/arch/linux-x86/AndroidConfig.h
@@ -333,4 +333,12 @@
  */
 #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 05dd22079..a6f709084 100644
--- a/include/arch/target_linux-x86/AndroidConfig.h
+++ b/include/arch/target_linux-x86/AndroidConfig.h
@@ -350,4 +350,12 @@
  */
 #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 ad890b4dd..8a7e0623d 100644
--- a/include/arch/windows/AndroidConfig.h
+++ b/include/arch/windows/AndroidConfig.h
@@ -338,4 +338,10 @@
  */
 /* #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*/