diff --git a/core/fxcrt/fx_system.cpp b/core/fxcrt/fx_system.cpp
index 73ae728..4f95b6a 100644
--- a/core/fxcrt/fx_system.cpp
+++ b/core/fxcrt/fx_system.cpp
@@ -246,14 +246,12 @@
   }
   return wlen;
 }
-#endif  // defined(OS_WIN)
 
-#if !defined(OS_WIN)
-void SetLastError(uint32_t err) {
+void FXSYS_SetLastError(uint32_t err) {
   g_last_error = err;
 }
 
-uint32_t GetLastError() {
+uint32_t FXSYS_GetLastError() {
   return g_last_error;
 }
-#endif  // !defined(OS_WIN)
+#endif  // defined(OS_WIN)
diff --git a/core/fxcrt/fx_system.h b/core/fxcrt/fx_system.h
index 667de6e..8872c57 100644
--- a/core/fxcrt/fx_system.h
+++ b/core/fxcrt/fx_system.h
@@ -139,9 +139,9 @@
                       size_t maxsize,
                       const wchar_t* format,
                       const struct tm* timeptr);
-
+#define FXSYS_SetLastError SetLastError
+#define FXSYS_GetLastError GetLastError
 #else  // _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
-
 int FXSYS_GetACP();
 char* FXSYS_itoa(int value, char* str, int radix);
 int FXSYS_WideCharToMultiByte(uint32_t codepage,
@@ -166,6 +166,8 @@
 wchar_t* FXSYS_wcsupr(wchar_t* str);
 #define FXSYS_pow(a, b) (float)pow(a, b)
 #define FXSYS_wcsftime wcsftime
+void FXSYS_SetLastError(uint32_t err);
+uint32_t FXSYS_GetLastError();
 #endif  // _FX_PLATFORM_ == _FX_PLATFORM_WINDOWS_
 
 #define FXWORD_GET_LSBFIRST(p)                                \
@@ -220,10 +222,4 @@
 
 #endif  // _FX_PLATFORM_ != _FX_PLATFORM_WINDOWS_
 
-// Provide SetLastError() and GetLastError() fills for non-windows platforms.
-#if _FX_PLATFORM_ != _FX_PLATFORM_WINDOWS_
-void SetLastError(uint32_t err);
-uint32_t GetLastError();
-#endif
-
 #endif  // CORE_FXCRT_FX_SYSTEM_H_
diff --git a/fpdfsdk/cpdfsdk_helpers.cpp b/fpdfsdk/cpdfsdk_helpers.cpp
index 1d7690f..3687f70 100644
--- a/fpdfsdk/cpdfsdk_helpers.cpp
+++ b/fpdfsdk/cpdfsdk_helpers.cpp
@@ -420,5 +420,5 @@
       err_code = FPDF_ERR_SECURITY;
       break;
   }
-  SetLastError(err_code);
+  FXSYS_SetLastError(err_code);
 }
diff --git a/fpdfsdk/fpdf_view.cpp b/fpdfsdk/fpdf_view.cpp
index b87fcc1..d724330 100644
--- a/fpdfsdk/fpdf_view.cpp
+++ b/fpdfsdk/fpdf_view.cpp
@@ -742,7 +742,7 @@
 }
 
 FPDF_EXPORT unsigned long FPDF_CALLCONV FPDF_GetLastError() {
-  return GetLastError();
+  return FXSYS_GetLastError();
 }
 
 FPDF_EXPORT FPDF_BOOL FPDF_CALLCONV FPDF_DeviceToPage(FPDF_PAGE page,
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_context.cpp b/fpdfsdk/fpdfxfa/cpdfxfa_context.cpp
index 9884b1e..349cc5d 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_context.cpp
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_context.cpp
@@ -103,13 +103,13 @@
   m_pXFADoc =
       CXFA_FFDoc::CreateAndOpen(m_pXFAApp.get(), &m_DocEnv, m_pPDFDoc.Get());
   if (!m_pXFADoc) {
-    SetLastError(FPDF_ERR_XFALOAD);
+    FXSYS_SetLastError(FPDF_ERR_XFALOAD);
     return false;
   }
 
   CJS_Runtime* actual_runtime = GetCJSRuntime();  // Null if a stub.
   if (!actual_runtime) {
-    SetLastError(FPDF_ERR_XFALOAD);
+    FXSYS_SetLastError(FPDF_ERR_XFALOAD);
     return false;
   }
 
@@ -122,7 +122,7 @@
   m_pXFADocView = m_pXFADoc->CreateDocView();
   if (m_pXFADocView->StartLayout() < 0) {
     CloseXFADoc();
-    SetLastError(FPDF_ERR_XFALAYOUT);
+    FXSYS_SetLastError(FPDF_ERR_XFALAYOUT);
     return false;
   }