diff --git a/source/interface/progress_bar.c b/source/interface/progress_bar.c
index 5e9e237a..3d4af83a 100644
--- a/source/interface/progress_bar.c
+++ b/source/interface/progress_bar.c
@@ -171,6 +171,8 @@ symbols in this file:
 
 /* ---------- headers */
 
+#include "interface/progress_bar.h"
+
 /* ---------- constants */
 
 /* ---------- macros */
@@ -183,4 +185,10 @@ symbols in this file:
 
 /* ---------- public code */
 
+void progress_bar_dispose(
+	void)
+{
+	return;
+}
+
 /* ---------- private code */
diff --git a/source/interface/progress_bar.h b/source/interface/progress_bar.h
index 3473a1ff..6e5997e2 100644
--- a/source/interface/progress_bar.h
+++ b/source/interface/progress_bar.h
@@ -10,6 +10,7 @@ header included in hcex build.
 
 /* ---------- headers */
 
+#include "cseries/cseries.h"
 #include "real_math.h"
 
 /* ---------- constants */
@@ -20,6 +21,8 @@ header included in hcex build.
 
 /* ---------- prototypes/PROGRESS_BAR.C */
 
+void progress_bar_dispose(
+	void);
 void progress_bar_display(real progress);
 
 /* ---------- globals */