diff --git a/hal/hal.pspec b/hal/hal.pspec
index 74193047c28..3fff8370170 100644
--- a/hal/hal.pspec
+++ b/hal/hal.pspec
@@ -8,7 +8,8 @@
 @ fastcall -arch=i386 ExAcquireFastMutex(ptr) ExiAcquireFastMutex
 @ fastcall -arch=i386 ExReleaseFastMutex(ptr) ExiReleaseFastMutex
 #endif
-@ fastcall -arch=i386,arm ExTryToAcquireFastMutex(ptr) ExiTryToAcquireFastMutex
+@ fastcall -arch=i386 ExTryToAcquireFastMutex(ptr) ntoskrnl.ExiTryToAcquireFastMutex
+@ fastcall -arch=arm ExTryToAcquireFastMutex(ptr)
 @ fastcall HalClearSoftwareInterrupt(long)
 @ fastcall HalRequestSoftwareInterrupt(long)
 @ fastcall HalSystemVectorDispatchEntry(long long long)
diff --git a/include/reactos/arm/armddk.h b/include/reactos/arm/armddk.h
index bf3ddd60ae3..ad235b0b56b 100644
--- a/include/reactos/arm/armddk.h
+++ b/include/reactos/arm/armddk.h
@@ -206,12 +206,6 @@ extern volatile struct _KSYSTEM_TIME KeTickCount;
 #define RESULT_NEGATIVE 1
 #define RESULT_POSITIVE 2
 
-DECLSPEC_IMPORT
-BOOLEAN
-__fastcall
-ExiTryToAcquireFastMutex(
-    IN OUT PFAST_MUTEX FastMutex);
-
 DECLSPEC_IMPORT
 VOID
 __fastcall