--- a/modules/libjar/nsZipArchive.cpp
+++ b/modules/libjar/nsZipArchive.cpp
@@ -606,19 +606,19 @@ nsresult nsZipArchive::BuildFileList(PRF
     if (readaheadLength) {
 #if defined(XP_SOLARIS)
       posix_madvise(const_cast<uint8_t *>(startp), readaheadLength,
                     POSIX_MADV_WILLNEED);
 #elif defined(XP_UNIX)
       madvise(const_cast<uint8_t *>(startp), readaheadLength, MADV_WILLNEED);
 #elif defined(XP_WIN)
       static auto prefetchVirtualMemory =
-          reinterpret_cast<BOOL (*)(HANDLE, ULONG_PTR, PVOID, ULONG)>(
+          reinterpret_cast<BOOL (WINAPI *)(HANDLE, ULONG_PTR, PVOID, ULONG)>(
               GetProcAddress(GetModuleHandle(L"kernel32.dll"),
-                               "PrefetchVirtualMemory"));
+                             "PrefetchVirtualMemory"));
       if (prefetchVirtualMemory) {
         // Normally, we'd use WIN32_MEMORY_RANGE_ENTRY, but that requires
         // a different _WIN32_WINNT value before including windows.h, but
         // that causes complications with unified sources. It's a simple
         // enough struct anyways.
         struct {
           PVOID VirtualAddress;
           SIZE_T NumberOfBytes;