diff --git a/src/test/regress/input/create_function_2.source b/src/test/regress/input/create_function_2.source
index 1b013aedcb..c518559777 100644
--- a/src/test/regress/input/create_function_2.source
+++ b/src/test/regress/input/create_function_2.source
@@ -74,32 +74,32 @@ CREATE FUNCTION user_relns()
 CREATE FUNCTION pt_in_widget(point, widget)
    RETURNS bool
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 
 CREATE FUNCTION overpaid(emp)
    RETURNS bool
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 
 CREATE FUNCTION boxarea(box)
    RETURNS float8
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 
 CREATE FUNCTION interpt_pp(path, path)
    RETURNS point
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 
 CREATE FUNCTION reverse_name(name)
    RETURNS name
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 
 CREATE FUNCTION oldstyle_length(int4, text)
    RETURNS int4
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C;  -- intentionally not strict
 
 --
 -- Function dynamic loading
diff --git a/src/test/regress/output/create_function_2.source b/src/test/regress/output/create_function_2.source
index 98e1c29733..829393243e 100644
--- a/src/test/regress/output/create_function_2.source
+++ b/src/test/regress/output/create_function_2.source
@@ -58,27 +58,27 @@ CREATE FUNCTION user_relns()
 CREATE FUNCTION pt_in_widget(point, widget)
    RETURNS bool
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 CREATE FUNCTION overpaid(emp)
    RETURNS bool
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 CREATE FUNCTION boxarea(box)
    RETURNS float8
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 CREATE FUNCTION interpt_pp(path, path)
    RETURNS point
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 CREATE FUNCTION reverse_name(name)
    RETURNS name
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C STRICT;
 CREATE FUNCTION oldstyle_length(int4, text)
    RETURNS int4
    AS '@libdir@/regress@DLSUFFIX@'
-   LANGUAGE C;
+   LANGUAGE C;  -- intentionally not strict
 --
 -- Function dynamic loading
 --