diff --git a/Alc/ALc.c b/Alc/ALc.c
index e52f938f..82316846 100644
--- a/Alc/ALc.c
+++ b/Alc/ALc.c
@@ -737,7 +737,7 @@ enum LogLevel LogLevel = LogError;
 static ALCboolean TrapALCError = ALC_FALSE;
 
 /* One-time configuration init control */
-static althread_once_t alc_config_once = ALTHREAD_ONCE_INIT;
+static alonce_flag alc_config_once = AL_ONCE_INIT;
 
 /* Default effect that applies to sources that don't have an effect on send 0 */
 static ALeffect DefaultEffect;
@@ -1139,7 +1139,7 @@ static void alc_initconfig(void)
     if((str && str[0]) || ConfigValueStr(NULL, "default-reverb", &str))
         LoadReverbPreset(str, &DefaultEffect);
 }
-#define DO_INITCONFIG() althread_once(&alc_config_once, alc_initconfig)
+#define DO_INITCONFIG() alcall_once(&alc_config_once, alc_initconfig)
 
 
 /************************************************
diff --git a/Alc/compat.h b/Alc/compat.h
index 50516ce8..2765ef18 100644
--- a/Alc/compat.h
+++ b/Alc/compat.h
@@ -8,10 +8,6 @@
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
-typedef LONG althread_once_t;
-#define ALTHREAD_ONCE_INIT 0
-void althread_once(althread_once_t *once, void (*callback)(void));
-
 WCHAR *strdupW(const WCHAR *str);
 
 /* Opens a file with standard I/O. The filename is expected to be UTF-8. */
@@ -23,10 +19,6 @@ FILE *al_fopen(const char *fname, const char *mode);
 
 #include <pthread.h>
 
-#define althread_once_t pthread_once_t
-#define ALTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
-#define althread_once pthread_once
-
 #define al_fopen(_n, _m) fopen((_n), (_m))
 
 #if defined(HAVE_DLFCN_H) && !defined(IN_IDE_PARSER)
diff --git a/Alc/helpers.c b/Alc/helpers.c
index 79dac143..e1e94f10 100644
--- a/Alc/helpers.c
+++ b/Alc/helpers.c
@@ -311,17 +311,6 @@ void RestoreFPUMode(const FPUCtl *ctl)
 
 #ifdef _WIN32
 
-void althread_once(althread_once_t *once, void (*callback)(void))
-{
-    LONG ret;
-    while((ret=InterlockedExchange(once, 1)) == 1)
-        althrd_yield();
-    if(ret == 0)
-        callback();
-    InterlockedExchange(once, 2);
-}
-
-
 static WCHAR *FromUTF8(const char *str)
 {
     WCHAR *out = NULL;
diff --git a/Alc/threads.c b/Alc/threads.c
index d0aea6e8..d9dabec1 100644
--- a/Alc/threads.c
+++ b/Alc/threads.c
@@ -294,6 +294,17 @@ int altimespec_get(struct timespec *ts, int base)
     return 0;
 }
 
+
+void alcall_once(alonce_flag *once, void (*callback)(void))
+{
+    LONG ret;
+    while((ret=InterlockedExchange(once, 1)) == 1)
+        althrd_yield();
+    if(ret == 0)
+        (*callback)();
+    InterlockedExchange(once, 2);
+}
+
 #else
 
 #include <unistd.h>
@@ -304,6 +315,7 @@ int altimespec_get(struct timespec *ts, int base)
 
 
 extern inline int althrd_sleep(const struct timespec *ts, struct timespec *rem);
+extern inline void alcall_once(alonce_flag *once, void (*callback)(void));
 
 
 void althrd_setname(althrd_t thr, const char *name)
diff --git a/OpenAL32/Include/threads.h b/OpenAL32/Include/threads.h
index eade2406..afeaeb4b 100644
--- a/OpenAL32/Include/threads.h
+++ b/OpenAL32/Include/threads.h
@@ -29,9 +29,6 @@ typedef void (*altss_dtor_t)(void*);
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
-typedef DWORD althrd_t;
-typedef CRITICAL_SECTION almtx_t;
-typedef DWORD altss_t;
 
 #ifndef __MINGW32__
 struct timespec {
@@ -40,8 +37,15 @@ struct timespec {
 };
 #endif
 
+typedef DWORD althrd_t;
+typedef CRITICAL_SECTION almtx_t;
+typedef DWORD altss_t;
+typedef LONG alonce_flag;
+
+#define AL_ONCE_INIT 0
 
 int althrd_sleep(const struct timespec *ts, struct timespec *rem);
+void alcall_once(alonce_flag *once, void (*callback)(void));
 
 
 inline althrd_t althrd_current(void)
@@ -109,6 +113,9 @@ inline int altss_set(altss_t tss_id, void *val)
 typedef pthread_t althrd_t;
 typedef pthread_mutex_t almtx_t;
 typedef pthread_key_t altss_t;
+typedef pthread_once_t alonce_flag;
+
+#define AL_ONCE_INIT PTHREAD_ONCE_INIT
 
 
 inline althrd_t althrd_current(void)
@@ -190,6 +197,12 @@ inline int altss_set(altss_t tss_id, void *val)
     return althrd_success;
 }
 
+
+inline void alcall_once(alonce_flag *once, void (*callback)(void))
+{
+    pthread_once(once, callback);
+}
+
 #endif