diff --git a/modules/rostests/apitests/atl/CAtlArray.cpp b/modules/rostests/apitests/atl/CAtlArray.cpp
index 8d4bc70dda0..ef7828ed951 100644
--- a/modules/rostests/apitests/atl/CAtlArray.cpp
+++ b/modules/rostests/apitests/atl/CAtlArray.cpp
@@ -6,6 +6,11 @@
  *              Copyright 2019 Mark Jansen (mark.jansen@reactos.org)
  */
 
+#if defined(__GNUC__) && __GNUC__ >= 7
+// this is an intended behaviour
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
+#endif
+
 #ifdef HAVE_APITEST
     #include <apitest.h>
 #else
diff --git a/modules/rostests/apitests/crt/dll_startup.cpp b/modules/rostests/apitests/crt/dll_startup.cpp
index c6487fd6ac4..506b6599d74 100644
--- a/modules/rostests/apitests/crt/dll_startup.cpp
+++ b/modules/rostests/apitests/crt/dll_startup.cpp
@@ -8,6 +8,11 @@
 #include <apitest.h>
 #include "dll_startup.h"
 
+// we test the initial value of m_uninit variable here, so this is required
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-Wuninitialized"
+#endif
+
 static struct counter_values counter_values =
 {
     0, 0, 0, 0, 5656, 0, 0
diff --git a/modules/rostests/apitests/crt/sprintf.c b/modules/rostests/apitests/crt/sprintf.c
index 9a253e537f5..67945687797 100644
--- a/modules/rostests/apitests/crt/sprintf.c
+++ b/modules/rostests/apitests/crt/sprintf.c
@@ -16,10 +16,13 @@
 
 #ifdef _MSC_VER
 #pragma warning(disable:4778) // unterminated format string '%'
-#else
+#elif defined(__GNUC__)
 #pragma GCC diagnostic ignored "-Wformat"
 #pragma GCC diagnostic ignored "-Wformat-zero-length"
 #pragma GCC diagnostic ignored "-Wnonnull"
+#if __GNUC__ >= 7
+#pragma GCC diagnostic ignored "-Wformat-overflow"
+#endif
 #endif
 
 static
diff --git a/modules/rostests/apitests/crt/static_construct.cpp b/modules/rostests/apitests/crt/static_construct.cpp
index 3f8ff9ab25c..b26f2a1eabf 100644
--- a/modules/rostests/apitests/crt/static_construct.cpp
+++ b/modules/rostests/apitests/crt/static_construct.cpp
@@ -10,6 +10,10 @@
 #include <strsafe.h>
 #include "dll_startup.h"
 
+#ifdef __GNUC__
+#pragma GCC diagnostic ignored "-Wuninitialized"
+#endif
+
 extern "C"
 {
 extern int static_init_counter;
@@ -221,7 +225,7 @@ START_TEST(static_construct)
         ok(g_CreatedFileMapping == FALSE, "Expected the shared memory to be created by my parent!\n");
         return;
     }
-    
+
     TestInitStatic();
     TestDllStartup();
     TestStaticDestruct();