diff --git a/include/diagnostics.h b/include/diagnostics.h
index c1a2e8f520c..3a75f4e2719 100644
--- a/include/diagnostics.h
+++ b/include/diagnostics.h
@@ -78,6 +78,9 @@
 
 #elif defined (__GNUC__) /* GCC */
 
+# define DIAGNOSTIC_IGNORE_DEPRECATED_DECLARATIONS \
+  DIAGNOSTIC_IGNORE ("-Wdeprecated-declarations")
+
 # if __GNUC__ >= 7
 #  define DIAGNOSTIC_IGNORE_DEPRECATED_REGISTER \
    DIAGNOSTIC_IGNORE ("-Wregister")