diff --git a/modules/rostests/apitests/crt/_snprintf.c b/modules/rostests/apitests/crt/_snprintf.c
index 29580d66adf..7d476b0f550 100644
--- a/modules/rostests/apitests/crt/_snprintf.c
+++ b/modules/rostests/apitests/crt/_snprintf.c
@@ -1,2 +1,5 @@
+#include <stdio.h>
 #define func__sntprintf func__snprintf
+typedef int (__cdecl *PFN_sntprintf)(char *_Dest, size_t _Count, const char *_Format, ...);
+#define str_sntprintf "_snprintf"
 #include "_sntprintf.h"
diff --git a/modules/rostests/apitests/crt/_sntprintf.h b/modules/rostests/apitests/crt/_sntprintf.h
index 887fee7f665..48f49e66ed9 100644
--- a/modules/rostests/apitests/crt/_sntprintf.h
+++ b/modules/rostests/apitests/crt/_sntprintf.h
@@ -13,6 +13,23 @@
 #include <ndk/mmfuncs.h>
 #include <ndk/rtlfuncs.h>
 
+#ifndef TEST_STATIC_CRT
+
+static PFN_sntprintf p_sntprintf;
+
+static BOOL Init(void)
+{
+    HMODULE hdll = LoadLibraryA(TEST_DLL_NAME);
+    p_sntprintf = (PFN_sntprintf)GetProcAddress(hdll, str_sntprintf);
+    ok(p_sntprintf != NULL, "Failed to load %s from %s\n", str_sntprintf, TEST_DLL_NAME);
+    return (p_sntprintf != NULL);
+}
+
+#undef _sntprintf
+#define _sntprintf p_sntprintf
+
+#endif // !TEST_STATIC_CRT
+
 /* winetest_platform is "windows" for us, so broken() doesn't do what it should :( */
 #undef broken
 #define broken(x) 0
@@ -23,6 +40,14 @@ START_TEST(_sntprintf)
     size_t BufferSize = sizeof(Buffer) / sizeof(Buffer[0]);
     int Result;
 
+#ifndef TEST_STATIC_CRT
+    if (!Init())
+    {
+        skip("Skipping tests, because %s is not available\n", str_sntprintf);
+        return;
+    }
+#endif
+
     StartSeh()
         Result = _sntprintf(NULL, 0, _T("Hello"));
 #ifdef TEST_CRTDLL
@@ -35,7 +60,9 @@ START_TEST(_sntprintf)
     StartSeh()
         Result = _sntprintf(NULL, 1, _T("Hello"));
         ok_int(Result, (GetNTVersion() >= _WIN32_WINNT_VISTA) ? -1 : 5);
-#if defined(_UNICODE) || defined(TEST_CRTDLL)
+#if defined(TEST_CRTDLL)
+    EndSeh(STATUS_ACCESS_VIOLATION);
+#elif defined(_UNICODE)
     EndSeh((GetNTVersion() >= _WIN32_WINNT_VISTA) ? 0 : STATUS_ACCESS_VIOLATION);
 #else
     EndSeh(STATUS_SUCCESS);
diff --git a/modules/rostests/apitests/crt/_snwprintf.c b/modules/rostests/apitests/crt/_snwprintf.c
index 0f891982c23..23e7e6726cb 100644
--- a/modules/rostests/apitests/crt/_snwprintf.c
+++ b/modules/rostests/apitests/crt/_snwprintf.c
@@ -1,3 +1,6 @@
 #define _UNICODE
+#include <wchar.h>
 #define func__sntprintf func__snwprintf
+typedef int (__cdecl *PFN_sntprintf)(wchar_t *_Dest, size_t _Count, const wchar_t *_Format, ...);
+#define str_sntprintf "_snwprintf"
 #include "_sntprintf.h"
diff --git a/modules/rostests/apitests/crtdll/CMakeLists.txt b/modules/rostests/apitests/crtdll/CMakeLists.txt
index b4c5356cfa9..4a4a012c374 100644
--- a/modules/rostests/apitests/crtdll/CMakeLists.txt
+++ b/modules/rostests/apitests/crtdll/CMakeLists.txt
@@ -30,7 +30,7 @@ elseif(ARCH STREQUAL "amd64")
 endif()
 
 add_executable(crtdll_apitest testlist.c ${SOURCE_CRTDLL} ${crtdll_apitest_asm})
-target_compile_definitions(crtdll_apitest PRIVATE TEST_CRTDLL)
+target_compile_definitions(crtdll_apitest PRIVATE TEST_CRTDLL TEST_DLL_NAME="crtdll.dll")
 target_link_libraries(crtdll_apitest wine ${PSEH_LIB})
 set_module_type(crtdll_apitest win32cui)
 add_importlibs(crtdll_apitest crtdll msvcrt kernel32 ntdll)
diff --git a/modules/rostests/apitests/msvcrt/CMakeLists.txt b/modules/rostests/apitests/msvcrt/CMakeLists.txt
index 015c8d23fca..e40bc6c6127 100644
--- a/modules/rostests/apitests/msvcrt/CMakeLists.txt
+++ b/modules/rostests/apitests/msvcrt/CMakeLists.txt
@@ -81,7 +81,7 @@ list(APPEND SOURCE
 
 add_executable(msvcrt_apitest ${SOURCE})
 add_dependencies(msvcrt_apitest asm)
-target_compile_definitions(msvcrt_apitest PRIVATE TEST_MSVCRT)
+target_compile_definitions(msvcrt_apitest PRIVATE TEST_MSVCRT TEST_DLL_NAME="msvcrt.dll")
 target_link_libraries(msvcrt_apitest wine ${PSEH_LIB})
 set_module_type(msvcrt_apitest win32cui)
 add_importlibs(msvcrt_apitest msvcrt kernel32 ntdll)
diff --git a/modules/rostests/apitests/ntdll/CMakeLists.txt b/modules/rostests/apitests/ntdll/CMakeLists.txt
index 848def9058b..10009e1f1f0 100644
--- a/modules/rostests/apitests/ntdll/CMakeLists.txt
+++ b/modules/rostests/apitests/ntdll/CMakeLists.txt
@@ -26,7 +26,7 @@ list(APPEND SOURCE_CRT_TESTS
 )
 
 add_library(ntdll_crt_test_lib ${SOURCE_CRT_TESTS})
-target_compile_definitions(ntdll_crt_test_lib PRIVATE TEST_NTDLL)
+target_compile_definitions(ntdll_crt_test_lib PRIVATE TEST_NTDLL TEST_DLL_NAME="ntdll.dll")
 target_link_libraries(ntdll_crt_test_lib ${PSEH_LIB})
 add_dependencies(ntdll_crt_test_lib psdk)