diff --git a/scripts/expected_doxygen_warnings.txt b/scripts/expected_doxygen_warnings.txt
index ca71fda3f18..154e4feef9e 100644
--- a/scripts/expected_doxygen_warnings.txt
+++ b/scripts/expected_doxygen_warnings.txt
@@ -34,7 +34,7 @@ warning: Included by graph for 'namespace.h' not generated, too many nodes (110)
 warning: Included by graph for 'pointer_expr.h' not generated, too many nodes (116), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'prefix.h' not generated, too many nodes (85), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'simplify_expr.h' not generated, too many nodes (79), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
-warning: Included by graph for 'std_code.h' not generated, too many nodes (78), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
+warning: Included by graph for 'std_code.h' not generated, too many nodes (79), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'std_expr.h' not generated, too many nodes (241), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'std_types.h' not generated, too many nodes (96), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
 warning: Included by graph for 'symbol_table.h' not generated, too many nodes (95), threshold is 60. Consider increasing DOT_GRAPH_MAX_NODES.
diff --git a/src/ansi-c/c_expr.h b/src/ansi-c/c_expr.h
new file mode 100644
index 00000000000..3f81db6b301
--- /dev/null
+++ b/src/ansi-c/c_expr.h
@@ -0,0 +1,17 @@
+/*******************************************************************\
+
+Module: API to expression classes that are internal to the C frontend
+
+Author: Daniel Kroening, kroening@kroening.com
+
+\*******************************************************************/
+
+#ifndef CPROVER_ANSI_C_C_EXPR_H
+#define CPROVER_ANSI_C_C_EXPR_H
+
+/// \file ansi-c/c_expr.h
+/// API to expression classes that are internal to the C frontend
+
+#include <util/std_code.h>
+
+#endif // CPROVER_ANSI_C_C_EXPR_H