diff --git a/lib_com/prot_fx1.h b/lib_com/prot_fx1.h
index 536740741e213521ed6680360845ed89673c9e8c..b948a78b7d6c1e1422ffc7de33f8a5278f8ca058 100644
--- a/lib_com/prot_fx1.h
+++ b/lib_com/prot_fx1.h
@@ -436,4 +436,6 @@ void delay_signal(
   const Word16 delay  /* i  : delay in samples                  */
 );
 
+Word16 ceil_log_2( UWord64 val );
+
 #endif
\ No newline at end of file
diff --git a/lib_dec/ivas_qmetadata_dec.c b/lib_dec/ivas_qmetadata_dec.c
index 452a5b27234168cb8450429efdf61d5d217ba00d..bf480ea80995b2705503976b8f4950fcdb88ce73 100644
--- a/lib_dec/ivas_qmetadata_dec.c
+++ b/lib_dec/ivas_qmetadata_dec.c
@@ -41,6 +41,8 @@
 #include "wmc_auto.h"
 #include "prot.h"
 
+#include "prot_fx1.h"
+
 /*-----------------------------------------------------------------------*
  * Local function prototypes
  *-----------------------------------------------------------------------*/