diff --git a/subsystems/ntvdm/bop.c b/subsystems/ntvdm/bop.c
index e87c471463b..c93bdd1472f 100644
--- a/subsystems/ntvdm/bop.c
+++ b/subsystems/ntvdm/bop.c
@@ -23,7 +23,7 @@ EMULATOR_BOP_PROC BopProc[EMULATOR_MAX_BOP_NUM] = { NULL };
 
 /* PUBLIC FUNCTIONS ***********************************************************/
 
-VOID WINAPI RegisterBop(BYTE BopCode, EMULATOR_BOP_PROC BopHandler)
+VOID RegisterBop(BYTE BopCode, EMULATOR_BOP_PROC BopHandler)
 {
     BopProc[BopCode] = BopHandler;
 }
diff --git a/subsystems/ntvdm/bop.h b/subsystems/ntvdm/bop.h
index e472cb6f090..a936d1f25cb 100644
--- a/subsystems/ntvdm/bop.h
+++ b/subsystems/ntvdm/bop.h
@@ -20,7 +20,7 @@
 
 typedef VOID (WINAPI *EMULATOR_BOP_PROC)(LPWORD Stack);
 
-VOID WINAPI RegisterBop(BYTE BopCode, EMULATOR_BOP_PROC BopHandler);
+VOID RegisterBop(BYTE BopCode, EMULATOR_BOP_PROC BopHandler);
 VOID WINAPI EmulatorBiosOperation(PFAST486_STATE State, UCHAR BopCode);
 
 #endif // _BOP_H_
diff --git a/subsystems/ntvdm/int32.c b/subsystems/ntvdm/int32.c
index 3c2d4a3366e..32ba2f48d0a 100644
--- a/subsystems/ntvdm/int32.c
+++ b/subsystems/ntvdm/int32.c
@@ -146,7 +146,7 @@ VOID WINAPI ControlBop(LPWORD Stack)
         DPRINT1("Unassigned Control BOP Function: 0x%02X\n", FuncNum);
 }
 
-VOID WINAPI InitializeInt32(WORD BiosSegment)
+VOID InitializeInt32(WORD BiosSegment)
 {
     LPDWORD IntVecTable = (LPDWORD)BaseAddress;
     LPBYTE  BiosCode    = (LPBYTE)SEG_OFF_TO_PTR(BiosSegment, 0);
@@ -207,7 +207,7 @@ VOID WINAPI InitializeInt32(WORD BiosSegment)
     RegisterBop(BOP_CONTROL, ControlBop);
 }
 
-VOID WINAPI RegisterInt32(BYTE IntNumber, EMULATOR_INT32_PROC IntHandler)
+VOID RegisterInt32(BYTE IntNumber, EMULATOR_INT32_PROC IntHandler)
 {
     Int32Proc[IntNumber] = IntHandler;
 }
diff --git a/subsystems/ntvdm/int32.h b/subsystems/ntvdm/int32.h
index f4d3477fd7c..d6cced23348 100644
--- a/subsystems/ntvdm/int32.h
+++ b/subsystems/ntvdm/int32.h
@@ -23,8 +23,8 @@
 typedef VOID (WINAPI *EMULATOR_INT32_PROC)(LPWORD Stack);
 
 VOID WINAPI Int32Dispatch(LPWORD Stack);
-VOID WINAPI InitializeInt32(WORD BiosSegment);
-VOID WINAPI RegisterInt32(BYTE IntNumber, EMULATOR_INT32_PROC IntHandler);
+VOID InitializeInt32(WORD BiosSegment);
+VOID RegisterInt32(BYTE IntNumber, EMULATOR_INT32_PROC IntHandler);
 
 #endif // _INT32_H_