diff --git a/sdk/xtdk/rtlfuncs.h b/sdk/xtdk/rtlfuncs.h
index f909a63c..8f06e33d 100644
--- a/sdk/xtdk/rtlfuncs.h
+++ b/sdk/xtdk/rtlfuncs.h
@@ -59,25 +59,25 @@ RtlCompareMemory(IN PCVOID LeftBuffer,
                  IN PCVOID RightBuffer,
                  IN SIZE_T Length);
 
-XTCDECL
+XTAPI
 SIZE_T
 RtlCompareString(IN CONST PCHAR String1,
                  IN CONST PCHAR String2,
                  IN SIZE_T Length);
 
-XTCDECL
+XTAPI
 SIZE_T
 RtlCompareStringInsensitive(IN CONST PCHAR String1,
                             IN CONST PCHAR String2,
                             IN SIZE_T Length);
 
-XTCDECL
+XTAPI
 SIZE_T
 RtlCompareWideString(IN CONST PWCHAR String1,
                      IN CONST PWCHAR String2,
                      IN SIZE_T Length);
 
-XTCDECL
+XTAPI
 SIZE_T
 RtlCompareWideStringInsensitive(IN CONST PWCHAR String1,
                                 IN CONST PWCHAR String2,
@@ -89,7 +89,7 @@ RtlConcatenateString(OUT PCHAR Destination,
                      IN PCHAR Source,
                      IN SIZE_T Count);
 
-XTCDECL
+XTAPI
 PWCHAR
 RtlConcatenateWideString(OUT PWCHAR Destination,
                          IN PWCHAR Source,
@@ -155,12 +155,12 @@ RtlSetMemory(OUT PVOID Destination,
              IN UCHAR Byte,
              IN SIZE_T Length);
 
-XTCDECL
+XTAPI
 SIZE_T
 RtlStringLength(IN CONST PCHAR String,
                 IN SIZE_T MaxLength);
 
-XTCDECL
+XTAPI
 SIZE_T
 RtlStringToWideString(OUT PWCHAR Destination,
                       IN CONST PCHAR *Source,
@@ -172,13 +172,13 @@ RtlTokenizeString(IN PCHAR String,
                   IN CONST PCHAR Delimiter,
                   IN OUT PCHAR *SavePtr);
 
-XTCDECL
+XTAPI
 PWCHAR
 RtlTokenizeWideString(IN PWCHAR String,
                       IN CONST PWCHAR Delimiter,
                       IN OUT PWCHAR *SavePtr);
 
-XTCDECL
+XTAPI
 PCHAR
 RtlTrimLeftString(IN CONST PCHAR String);
 
@@ -186,7 +186,7 @@ XTAPI
 PWCHAR
 RtlTrimLeftWideString(IN CONST PWCHAR String);
 
-XTCDECL
+XTAPI
 PCHAR
 RtlTrimRightString(IN CONST PCHAR String);
 
@@ -194,7 +194,7 @@ XTAPI
 PWCHAR
 RtlTrimRightWideString(IN CONST PWCHAR String);
 
-XTCDECL
+XTAPI
 PCHAR
 RtlTrimString(IN CONST PCHAR String);
 
@@ -202,7 +202,7 @@ XTAPI
 PWCHAR
 RtlTrimWideString(IN CONST PWCHAR String);
 
-XTCDECL
+XTAPI
 SIZE_T
 RtlWideStringLength(IN CONST PWCHAR String,
                     IN SIZE_T MaxLength);
diff --git a/xtoskrnl/rtl/string.c b/xtoskrnl/rtl/string.c
index 6722753f..d65d6413 100644
--- a/xtoskrnl/rtl/string.c
+++ b/xtoskrnl/rtl/string.c
@@ -25,7 +25,7 @@
  *
  * @since XT 1.0
  */
-XTCDECL
+XTAPI
 SIZE_T
 RtlCompareString(IN CONST PCHAR String1,
                  IN CONST PCHAR String2,
@@ -77,7 +77,7 @@ RtlCompareString(IN CONST PCHAR String1,
  *
  * @since XT 1.0
  */
-XTCDECL
+XTAPI
 SIZE_T
 RtlCompareStringInsensitive(IN CONST PCHAR String1,
                             IN CONST PCHAR String2,
@@ -231,7 +231,7 @@ RtlReverseString(IN OUT PCHAR String,
  *
  * @since: XT 1.0
  */
-XTCDECL
+XTAPI
 SIZE_T
 RtlStringLength(IN CONST PCHAR String,
                 IN SIZE_T MaxLength)
@@ -276,7 +276,7 @@ RtlStringLength(IN CONST PCHAR String,
  *
  * @since XT 1.0
  */
-XTCDECL
+XTAPI
 SIZE_T
 RtlStringToWideString(OUT PWCHAR Destination,
                       IN CONST PCHAR *Source,
@@ -389,7 +389,7 @@ RtlTokenizeString(IN PCHAR String,
  *
  * @since XT 1.0
  */
-XTCDECL
+XTAPI
 PCHAR
 RtlTrimLeftString(IN CONST PCHAR String)
 {
@@ -419,7 +419,7 @@ RtlTrimLeftString(IN CONST PCHAR String)
  *
  * @since XT 1.0
  */
-XTCDECL
+XTAPI
 PCHAR
 RtlTrimRightString(IN CONST PCHAR String)
 {
@@ -452,7 +452,7 @@ RtlTrimRightString(IN CONST PCHAR String)
  *
  * @since XT 1.0
  */
-XTCDECL
+XTAPI
 PCHAR
 RtlTrimString(IN CONST PCHAR String)
 {
diff --git a/xtoskrnl/rtl/widestr.c b/xtoskrnl/rtl/widestr.c
index 518c93bb..82cdb080 100644
--- a/xtoskrnl/rtl/widestr.c
+++ b/xtoskrnl/rtl/widestr.c
@@ -25,7 +25,7 @@
  *
  * @since XT 1.0
  */
-XTCDECL
+XTAPI
 SIZE_T
 RtlCompareWideString(IN CONST PWCHAR String1,
                      IN CONST PWCHAR String2,
@@ -77,7 +77,7 @@ RtlCompareWideString(IN CONST PWCHAR String1,
  *
  * @since XT 1.0
  */
-XTCDECL
+XTAPI
 SIZE_T
 RtlCompareWideStringInsensitive(IN CONST PWCHAR String1,
                                 IN CONST PWCHAR String2,
@@ -144,7 +144,7 @@ RtlCompareWideStringInsensitive(IN CONST PWCHAR String1,
  *
  * @since XT 1.0
  */
-XTCDECL
+XTAPI
 PWCHAR
 RtlConcatenateWideString(OUT PWCHAR Destination,
                          IN PWCHAR Source,
@@ -234,7 +234,7 @@ RtlReverseWideString(IN OUT PWCHAR String,
  *
  * @since: XT 1.0
  */
-XTCDECL
+XTAPI
 PWCHAR
 RtlTokenizeWideString(IN PWCHAR String,
                       IN CONST PWCHAR Delimiter,
@@ -381,7 +381,7 @@ RtlTrimWideString(IN CONST PWCHAR String)
  *
  * @since: XT 1.0
  */
-XTCDECL
+XTAPI
 SIZE_T
 RtlWideStringLength(IN CONST PWCHAR String,
                     IN SIZE_T MaxLength)
diff --git a/xtoskrnl/xtoskrnl.spec b/xtoskrnl/xtoskrnl.spec
index df4b2cb9..d893bb7b 100644
--- a/xtoskrnl/xtoskrnl.spec
+++ b/xtoskrnl/xtoskrnl.spec
@@ -32,12 +32,12 @@
 @ stdcall KeSignalCallDpcSynchronize(ptr)
 @ stdcall RtlCompareGuids(ptr ptr)
 @ stdcall RtlCompareMemory(ptr ptr long)
-@ cdecl RtlCompareString(str str long)
-@ cdecl RtlCompareStringInsensitive(str str long)
-@ cdecl RtlCompareWideString(wstr wstr long)
-@ cdecl RtlCompareWideStringInsensitive(wstr wstr long)
+@ stdcall RtlCompareString(str str long)
+@ stdcall RtlCompareStringInsensitive(str str long)
+@ stdcall RtlCompareWideString(wstr wstr long)
+@ stdcall RtlCompareWideStringInsensitive(wstr wstr long)
 @ stdcall RtlConcatenateString(str str long)
-@ cdecl RtlConcatenateWideString(wstr wstr long)
+@ stdcall RtlConcatenateWideString(wstr wstr long)
 @ stdcall RtlConvertToLargeInteger32(long)
 @ stdcall RtlConvertToLargeIntegerUnsigned32(long)
 @ stdcall RtlCopyMemory(ptr ptr long)
@@ -52,17 +52,17 @@
 @ stdcall RtlReverseWideString(wstr long)
 @ stdcall RtlSameMemory(ptr ptr long)
 @ stdcall RtlSetMemory(ptr long long)
-@ cdecl RtlStringLength(str long)
-@ cdecl RtlStringToWideString(wstr str long)
+@ stdcall RtlStringLength(str long)
+@ stdcall RtlStringToWideString(wstr str long)
 @ stdcall RtlTokenizeString(str str str)
-@ cdecl RtlTokenizeWideString(wstr wstr wstr)
-@ cdecl RtlTrimLeftString(str)
+@ stdcall RtlTokenizeWideString(wstr wstr wstr)
+@ stdcall RtlTrimLeftString(str)
 @ stdcall RtlTrimLeftWideString(wstr)
-@ cdecl RtlTrimRightString(str)
+@ stdcall RtlTrimRightString(str)
 @ stdcall RtlTrimRightWideString(wstr)
-@ cdecl RtlTrimString(str)
+@ stdcall RtlTrimString(str)
 @ stdcall RtlTrimWideString(wstr)
-@ cdecl RtlWideStringLength(wstr long)
+@ stdcall RtlWideStringLength(wstr long)
 @ stdcall RtlWriteRegisterByte(ptr long)
 @ stdcall RtlWriteRegisterLong(ptr long)
 @ stdcall RtlWriteRegisterShort(ptr long)