diff --git a/clock.h b/clock.h
index cc77983..9035d79 100644
--- a/clock.h
+++ b/clock.h
@@ -127,9 +127,9 @@ struct PsnipClockTimespec {
 #    endif
 #  endif
 #  if !defined(PSNIP_CLOCK_MONOTONIC_METHOD)
-#    if defined(CLOCK_MONOTONIC_RAW)
+#    if defined(CLOCK_MONOTONIC_RAW) && !defined(__EMSCRIPTEN__)
 #      define PSNIP_CLOCK_MONOTONIC_METHOD PSNIP_CLOCK_METHOD_CLOCK_GETTIME
-#      define PSNIP_CLOCK_CLOCK_GETTIME_MONOTONIC CLOCK_MONOTONIC
+#      define PSNIP_CLOCK_CLOCK_GETTIME_MONOTONIC CLOCK_MONOTONIC_RAW
 #    elif defined(CLOCK_MONOTONIC_PRECISE)
 #      define PSNIP_CLOCK_MONOTONIC_METHOD PSNIP_CLOCK_METHOD_CLOCK_GETTIME
 #      define PSNIP_CLOCK_CLOCK_GETTIME_MONOTONIC CLOCK_MONOTONIC_PRECISE
@@ -203,10 +203,15 @@ typedef union _LARGE_INTEGER {
   } u;
   int64_t QuadPart;
 } LARGE_INTEGER;
-void * __stdcall GetCurrentProcess(void);
-int __stdcall QueryPerformanceFrequency(LARGE_INTEGER *lpFrequency);
-int __stdcall QueryPerformanceCounter(LARGE_INTEGER *lpPerformanceCount);
-int __stdcall GetProcessTimes(
+#ifdef __cplusplus
+#define PSNIP_EXTERN extern "C"
+#else
+#define PSNIP_EXTERN
+#endif
+PSNIP_EXTERN void * __stdcall GetCurrentProcess(void);
+PSNIP_EXTERN int __stdcall QueryPerformanceFrequency(LARGE_INTEGER *lpFrequency);
+PSNIP_EXTERN int __stdcall QueryPerformanceCounter(LARGE_INTEGER *lpPerformanceCount);
+PSNIP_EXTERN int __stdcall GetProcessTimes(
   void *hProcess,
   FILETIME *lpCreationTime,
   FILETIME *lpExitTime,