diff --git a/src/frontends/lean/decl_cmds.cpp b/src/frontends/lean/decl_cmds.cpp
index e160523ea..b0bf613a8 100644
--- a/src/frontends/lean/decl_cmds.cpp
+++ b/src/frontends/lean/decl_cmds.cpp
@@ -341,7 +341,7 @@ environment definition_cmd_core(parser & p, bool is_theorem, bool is_opaque, boo
     if (modifiers.m_is_instance) {
         bool persistent = true;
         if (modifiers.m_priority) {
-            #if defined(__GNUC__)
+            #if defined(__GNUC__) && !defined(__CLANG__)
             #pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
             #endif
             env = add_instance(env, real_n, *modifiers.m_priority, persistent);