diff --git a/reactos/include/ddk/ntddk.h b/reactos/include/ddk/ntddk.h
index 58764969295..42a3c4230d6 100644
--- a/reactos/include/ddk/ntddk.h
+++ b/reactos/include/ddk/ntddk.h
@@ -1908,8 +1908,9 @@ typedef struct _HAL_PLATFORM_INFORMATION {
 #define NX_SUPPORT_POLICY_OPTOUT 3
 
 typedef VOID
-(NTAPI *PEXPAND_STACK_CALLOUT)(
+(NTAPI EXPAND_STACK_CALLOUT)(
   IN PVOID Parameter OPTIONAL);
+typedef EXPAND_STACK_CALLOUT *PEXPAND_STACK_CALLOUT;
 
 typedef VOID
 (NTAPI *PTIMER_APC_ROUTINE)(
diff --git a/reactos/include/ddk/wdm.h b/reactos/include/ddk/wdm.h
index 0acc3a5a46a..d70b8cf9ea7 100644
--- a/reactos/include/ddk/wdm.h
+++ b/reactos/include/ddk/wdm.h
@@ -1390,8 +1390,9 @@ typedef enum _LOCK_OPERATION {
 #define KTIMER_ACTUAL_LENGTH (FIELD_OFFSET(KTIMER, Period) + sizeof(LONG))
 
 typedef BOOLEAN
-(NTAPI *PKSYNCHRONIZE_ROUTINE)(
+(NTAPI KSYNCHRONIZE_ROUTINE)(
   IN PVOID SynchronizeContext);
+typedef KSYNCHRONIZE_ROUTINE *PKSYNCHRONIZE_ROUTINE;
 
 typedef enum _POOL_TYPE {
   NonPagedPool,
diff --git a/reactos/include/xdk/ketypes.h b/reactos/include/xdk/ketypes.h
index 1d06cc87593..0bbb6964297 100644
--- a/reactos/include/xdk/ketypes.h
+++ b/reactos/include/xdk/ketypes.h
@@ -826,8 +826,9 @@ typedef enum _LOCK_OPERATION {
 #define KTIMER_ACTUAL_LENGTH (FIELD_OFFSET(KTIMER, Period) + sizeof(LONG))
 
 typedef BOOLEAN
-(NTAPI *PKSYNCHRONIZE_ROUTINE)(
+(NTAPI KSYNCHRONIZE_ROUTINE)(
   IN PVOID SynchronizeContext);
+typedef KSYNCHRONIZE_ROUTINE *PKSYNCHRONIZE_ROUTINE;
 
 typedef enum _POOL_TYPE {
   NonPagedPool,
@@ -1007,8 +1008,9 @@ $if (_NTDDK_)
 #define NX_SUPPORT_POLICY_OPTOUT 3
 
 typedef VOID
-(NTAPI *PEXPAND_STACK_CALLOUT)(
+(NTAPI EXPAND_STACK_CALLOUT)(
   IN PVOID Parameter OPTIONAL);
+typedef EXPAND_STACK_CALLOUT *PEXPAND_STACK_CALLOUT;
 
 typedef VOID
 (NTAPI *PTIMER_APC_ROUTINE)(