diff --git a/src/libiir/000_TopHeader.h b/src/libiir/000_TopHeader.h
index 027d784..fedd597 100644
--- a/src/libiir/000_TopHeader.h
+++ b/src/libiir/000_TopHeader.h
@@ -11,6 +11,10 @@
 /* standard includes, or includes needed for type declarations */
 #include <complex.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* options for text editors
 vim: expandtab:ts=4:sw=4:syntax=c.doxygen
 */
diff --git a/src/libiir/999_BottomHeader.h b/src/libiir/999_BottomHeader.h
index 731ec5a..f8e0f79 100644
--- a/src/libiir/999_BottomHeader.h
+++ b/src/libiir/999_BottomHeader.h
@@ -5,6 +5,10 @@
  *  License: GPLv3
 */
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif
 
 /* options for text editors