diff --git a/reactos/lib/msvcrt/string/lasttok.c b/reactos/lib/msvcrt/string/lasttok.c
index 5b322e5d712..fbe0cc9f1f0 100644
--- a/reactos/lib/msvcrt/string/lasttok.c
+++ b/reactos/lib/msvcrt/string/lasttok.c
@@ -1,4 +1,5 @@
 #include <msvcrt/internal/tls.h>
+#include <msvcrt/assert.h>
 
 /*
  * This is an MSVCRT internal function to return the lasttoken
@@ -9,6 +10,6 @@
 char** _lasttoken()
 {
 	PTHREADDATA ptd = GetThreadData();
-	_assert(ptd);
+	assert(ptd);
 	return &(ptd->lasttoken);
 }
diff --git a/reactos/lib/msvcrt/wstring/wlasttok.c b/reactos/lib/msvcrt/wstring/wlasttok.c
index 41a93e4e01c..fcc80c06d0e 100644
--- a/reactos/lib/msvcrt/wstring/wlasttok.c
+++ b/reactos/lib/msvcrt/wstring/wlasttok.c
@@ -1,5 +1,5 @@
 #include <msvcrt/internal/tls.h>
-
+#include <msvcrt/assert.h>
 /*
  * This is an MSVCRT internal function to return the lasttoken
  * bit of data used by wcstok. The reason for it's existence is
@@ -9,6 +9,6 @@
 wchar_t** _wlasttoken()
 {
 	PTHREADDATA ptd = GetThreadData();
-	_assert(ptd);
+	assert(ptd);
 	return &(ptd->wlasttoken);
 }