diff --git a/src/test/examples/Makefile b/src/test/examples/Makefile
index a67f456904..4bcc2f88df 100644
--- a/src/test/examples/Makefile
+++ b/src/test/examples/Makefile
@@ -14,7 +14,7 @@ override CPPFLAGS := -I$(libpq_srcdir) $(CPPFLAGS)
 LDFLAGS_INTERNAL += $(libpq_pgport)
 
 
-PROGS = testlibpq testlibpq2 testlibpq3 testlibpq4 testlo testlo64
+PROGS = testlibpq testlibpq2 testlibpq3 testlibpq4 testlo testlo64 testfloat4
 
 all: $(PROGS)
 
diff --git a/src/test/examples/testfloat4.c b/src/test/examples/testfloat4.c
new file mode 100644
index 0000000000..a2256f067d
--- /dev/null
+++ b/src/test/examples/testfloat4.c
@@ -0,0 +1,35 @@
+/*
+ *	Include the same headers as
+ *	  src/backend/utils/adt/numeric.c
+ */
+#include "postgres.h"
+
+#include <ctype.h>
+#include <float.h>
+#include <limits.h>
+#include <math.h>
+
+#include "access/hash.h"
+#include "catalog/pg_type.h"
+#include "common/int.h"
+#include "funcapi.h"
+#include "lib/hyperloglog.h"
+#include "libpq/pqformat.h"
+#include "miscadmin.h"
+#include "nodes/nodeFuncs.h"
+#include "utils/array.h"
+#include "utils/builtins.h"
+#include "utils/float.h"
+#include "utils/guc.h"
+#include "utils/int8.h"
+#include "utils/numeric.h"
+#include "utils/sortsupport.h"
+
+int
+main()
+{
+	char *tmp = "3.14";
+	// undefined reference
+	DirectFunctionCall1(float4in, CStringGetDatum(tmp));
+	return 0;
+}