diff --git a/src/api/z3_replayer.cpp b/src/api/z3_replayer.cpp
index 6af8b2e0b..f044cb142 100644
--- a/src/api/z3_replayer.cpp
+++ b/src/api/z3_replayer.cpp
@@ -29,7 +29,7 @@ Notes:
 void register_z3_replayer_cmds(z3_replayer & in);
 
 
-void throw_invalid_reference() {
+static void throw_invalid_reference() {
     TRACE(z3_replayer, tout << "invalid argument reference\n";);
     throw z3_replayer_exception("invalid argument reference");
 }
diff --git a/src/ast/ast.cpp b/src/ast/ast.cpp
index ac2cb843c..5edeeb7b1 100644
--- a/src/ast/ast.cpp
+++ b/src/ast/ast.cpp
@@ -3505,7 +3505,7 @@ void scoped_mark::pop_scope(unsigned num_scopes) {
 
 // show an expr_ref on stdout
 
-void prexpr(expr_ref &e){
+static void prexpr(expr_ref &e){
     std::cout << mk_pp(e.get(), e.get_manager()) << std::endl;
 }