diff --git a/mongoose.h b/mongoose.h
index 51ba7b82..438cc3f3 100644
--- a/mongoose.h
+++ b/mongoose.h
@@ -386,6 +386,10 @@ static inline int mg_mkdir(const char *path, mode_t mode) {
 #define MG_PATH_MAX FILENAME_MAX
 #endif
 
+#ifndef MG_ENABLE_POSIX_FS
+#define MG_ENABLE_POSIX_FS 1
+#endif
+
 #endif
 
 
@@ -499,6 +503,10 @@ typedef int socklen_t;
 #define SIGPIPE 0
 #endif
 
+#ifndef MG_ENABLE_POSIX_FS
+#define MG_ENABLE_POSIX_FS 1
+#endif
+
 #endif
 
 
@@ -782,12 +790,8 @@ struct timeval {
 #endif
 
 #ifndef MG_ENABLE_POSIX_FS
-#if defined(FOPEN_MAX)
-#define MG_ENABLE_POSIX_FS 1
-#else
 #define MG_ENABLE_POSIX_FS 0
 #endif
-#endif
 
 #ifndef MG_INVALID_SOCKET
 #define MG_INVALID_SOCKET (-1)
@@ -3070,46 +3074,6 @@ struct mg_tcpip_driver_tm4c_data {
 #endif
 
 
-#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_W5500) && MG_ENABLE_DRIVER_W5500
-
-#endif
-
-
-#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_XMC7) && MG_ENABLE_DRIVER_XMC7
-
-struct mg_tcpip_driver_xmc7_data {
-  int mdc_cr;  // Valid values: -1, 0, 1, 2, 3, 4, 5
-  uint8_t phy_addr;
-};
-
-#ifndef MG_TCPIP_PHY_ADDR
-#define MG_TCPIP_PHY_ADDR 0
-#endif
-
-#ifndef MG_DRIVER_MDC_CR
-#define MG_DRIVER_MDC_CR 3
-#endif
-
-#define MG_TCPIP_DRIVER_INIT(mgr)                                 \
-  do {                                                            \
-    static struct mg_tcpip_driver_xmc7_data driver_data_;       \
-    static struct mg_tcpip_if mif_;                               \
-    driver_data_.mdc_cr = MG_DRIVER_MDC_CR;                       \
-    driver_data_.phy_addr = MG_TCPIP_PHY_ADDR;                    \
-    mif_.ip = MG_TCPIP_IP;                                        \
-    mif_.mask = MG_TCPIP_MASK;                                    \
-    mif_.gw = MG_TCPIP_GW;                                        \
-    mif_.driver = &mg_tcpip_driver_xmc7;                        \
-    mif_.driver_data = &driver_data_;                             \
-    MG_SET_MAC_ADDRESS(mif_.mac);                                 \
-    mg_tcpip_init(mgr, &mif_);                                    \
-    MG_INFO(("Driver: xmc7, MAC: %M", mg_print_mac, mif_.mac)); \
-  } while (0)
-
-#endif
-
-
-
 #if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_XMC) && MG_ENABLE_DRIVER_XMC
 
 struct mg_tcpip_driver_xmc_data {
@@ -3156,6 +3120,41 @@ struct mg_tcpip_driver_xmc_data {
 
 #endif
 
+
+#if MG_ENABLE_TCPIP && defined(MG_ENABLE_DRIVER_XMC7) && MG_ENABLE_DRIVER_XMC7
+
+struct mg_tcpip_driver_xmc7_data {
+  int mdc_cr;  // Valid values: -1, 0, 1, 2, 3, 4, 5
+  uint8_t phy_addr;
+};
+
+#ifndef MG_TCPIP_PHY_ADDR
+#define MG_TCPIP_PHY_ADDR 0
+#endif
+
+#ifndef MG_DRIVER_MDC_CR
+#define MG_DRIVER_MDC_CR 3
+#endif
+
+#define MG_TCPIP_DRIVER_INIT(mgr)                                 \
+  do {                                                            \
+    static struct mg_tcpip_driver_xmc7_data driver_data_;       \
+    static struct mg_tcpip_if mif_;                               \
+    driver_data_.mdc_cr = MG_DRIVER_MDC_CR;                       \
+    driver_data_.phy_addr = MG_TCPIP_PHY_ADDR;                    \
+    mif_.ip = MG_TCPIP_IP;                                        \
+    mif_.mask = MG_TCPIP_MASK;                                    \
+    mif_.gw = MG_TCPIP_GW;                                        \
+    mif_.driver = &mg_tcpip_driver_xmc7;                        \
+    mif_.driver_data = &driver_data_;                             \
+    MG_SET_MAC_ADDRESS(mif_.mac);                                 \
+    mg_tcpip_init(mgr, &mif_);                                    \
+    MG_INFO(("Driver: xmc7, MAC: %M", mg_print_mac, mif_.mac)); \
+  } while (0)
+
+#endif
+
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/arch_unix.h b/src/arch_unix.h
index eaf1876d..ea76e3b4 100644
--- a/src/arch_unix.h
+++ b/src/arch_unix.h
@@ -56,4 +56,8 @@
 #define MG_PATH_MAX FILENAME_MAX
 #endif
 
+#ifndef MG_ENABLE_POSIX_FS
+#define MG_ENABLE_POSIX_FS 1
+#endif
+
 #endif
diff --git a/src/arch_win32.h b/src/arch_win32.h
index ab96ec72..2f9a7074 100644
--- a/src/arch_win32.h
+++ b/src/arch_win32.h
@@ -110,4 +110,8 @@ typedef int socklen_t;
 #define SIGPIPE 0
 #endif
 
+#ifndef MG_ENABLE_POSIX_FS
+#define MG_ENABLE_POSIX_FS 1
+#endif
+
 #endif
diff --git a/src/config.h b/src/config.h
index d1acf6b5..37e6c54d 100644
--- a/src/config.h
+++ b/src/config.h
@@ -118,12 +118,8 @@
 #endif
 
 #ifndef MG_ENABLE_POSIX_FS
-#if defined(FOPEN_MAX)
-#define MG_ENABLE_POSIX_FS 1
-#else
 #define MG_ENABLE_POSIX_FS 0
 #endif
-#endif
 
 #ifndef MG_INVALID_SOCKET
 #define MG_INVALID_SOCKET (-1)