diff --git a/src/util/ca_test.h b/src/util/ca_test.h
index 9ce71420e..b84e4059f 100644
--- a/src/util/ca_test.h
+++ b/src/util/ca_test.h
@@ -27,4 +27,13 @@
  * -----------------
  * .01	21JAN2000	mrk	split main from ca_test.c
  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 int ca_test(char *pname, char *pvalue);
+
+#ifdef __cplusplus
+}
+#endif