diff --git a/src/string_bytes.h b/src/string_bytes.h
index 451c39955f7ef7..7902bf0b618255 100644
--- a/src/string_bytes.h
+++ b/src/string_bytes.h
@@ -26,7 +26,14 @@
 
 // Decodes a v8::Local<v8::String> or Buffer to a raw char*
 
+#if (__GNUC__ >= 8) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-function-type"
+#endif
 #include "v8.h"
+#if (__GNUC__ >= 8) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
 #include "env-inl.h"
 
 #include <string>
diff --git a/test/cctest/test_aliased_buffer.cc b/test/cctest/test_aliased_buffer.cc
index ba947700c1bf27..4dab70d0b576cb 100644
--- a/test/cctest/test_aliased_buffer.cc
+++ b/test/cctest/test_aliased_buffer.cc
@@ -1,4 +1,11 @@
+#if (__GNUC__ >= 8) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-function-type"
+#endif
 #include "v8.h"
+#if (__GNUC__ >= 8) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
 #include "aliased_buffer.h"
 #include "node_test_fixture.h"