diff --git a/libarmbox/cs_api.h b/libarmbox/cs_api.h
index fb5d613..e4349dd 100644
--- a/libarmbox/cs_api.h
+++ b/libarmbox/cs_api.h
@@ -62,5 +62,6 @@ unsigned long long cs_get_serial(void);
 #endif
 /* compat... HD1 seems to be version 6. everything newer ist > 6... */
 static inline unsigned int cs_get_revision(void) { return 1; };
+static inline unsigned int cs_get_chip_type(void) { return 0; };
 extern int cnxt_debug;
 #endif //__CS_API_H_
diff --git a/libduckbox/cs_api.h b/libduckbox/cs_api.h
index 8ac8d93..1082ab7 100644
--- a/libduckbox/cs_api.h
+++ b/libduckbox/cs_api.h
@@ -26,5 +26,6 @@ static inline void cs_deregister_messenger(void) { return; };
 
 /* compat... HD1 seems to be version 6. everything newer ist > 6... */
 static inline unsigned int cs_get_revision(void) { return 1; };
+static inline unsigned int cs_get_chip_type(void) { return 0; };
 extern int cnxt_debug;
 #endif //__CS_API_H_
diff --git a/libspark/cs_api.h b/libspark/cs_api.h
index fb5d613..e4349dd 100644
--- a/libspark/cs_api.h
+++ b/libspark/cs_api.h
@@ -62,5 +62,6 @@ unsigned long long cs_get_serial(void);
 #endif
 /* compat... HD1 seems to be version 6. everything newer ist > 6... */
 static inline unsigned int cs_get_revision(void) { return 1; };
+static inline unsigned int cs_get_chip_type(void) { return 0; };
 extern int cnxt_debug;
 #endif //__CS_API_H_
diff --git a/libtriple/cs_api.h b/libtriple/cs_api.h
index 292430d..47890e0 100644
--- a/libtriple/cs_api.h
+++ b/libtriple/cs_api.h
@@ -62,5 +62,6 @@ unsigned long long cs_get_serial(void);
 #endif
 /* compat... HD1 seems to be version 6. everything newer ist > 6... */
 static inline unsigned int cs_get_revision(void) { return 1; };
+static inline unsigned int cs_get_chip_type(void) { return 0; };
 extern int cnxt_debug;
 #endif //__CS_API_H_