diff --git a/src/training/cntraining.cpp b/src/training/cntraining.cpp
index e3949edf..55d520a5 100644
--- a/src/training/cntraining.cpp
+++ b/src/training/cntraining.cpp
@@ -45,21 +45,11 @@ DECLARE_STRING_PARAM_FLAG(D);
           Private Function Prototypes
 ----------------------------------------------------------------------------*/
 
-void WriteNormProtos(const char *Directory, LIST LabeledProtoList,
-                     const FEATURE_DESC_STRUCT *feature_desc);
+static void WriteNormProtos(const char *Directory, LIST LabeledProtoList,
+                            const FEATURE_DESC_STRUCT *feature_desc);
 
-/*
-PARAMDESC *ConvertToPARAMDESC(
-  PARAM_DESC* Param_Desc,
-  int N);
-*/
-
-void WriteProtos(
-     FILE  *File,
-     uint16_t  N,
-     LIST  ProtoList,
-     BOOL8  WriteSigProtos,
-     BOOL8  WriteInsigProtos);
+static void WriteProtos(FILE* File, uint16_t N, LIST ProtoList,
+                        bool WriteSigProtos, bool WriteInsigProtos);
 
 /*----------------------------------------------------------------------------
           Global Data Definitions and Declarations
@@ -216,8 +206,8 @@ int main(int argc, char *argv[]) {
 * @note Exceptions: none
 * @note History: Fri Aug 18 16:17:06 1989, DSJ, Created.
 */
-void WriteNormProtos(const char *Directory, LIST LabeledProtoList,
-                     const FEATURE_DESC_STRUCT *feature_desc) {
+static void WriteNormProtos(const char *Directory, LIST LabeledProtoList,
+                            const FEATURE_DESC_STRUCT *feature_desc) {
   FILE    *File;
   STRING Filename;
   LABELEDLIST LabeledProto;
@@ -254,12 +244,9 @@ void WriteNormProtos(const char *Directory, LIST LabeledProtoList,
 }  // WriteNormProtos
 
 /*-------------------------------------------------------------------------*/
-void WriteProtos(
-     FILE  *File,
-     uint16_t  N,
-     LIST  ProtoList,
-     BOOL8  WriteSigProtos,
-     BOOL8  WriteInsigProtos)
+
+static void WriteProtos(FILE* File, uint16_t N, LIST ProtoList,
+                        bool WriteSigProtos, bool WriteInsigProtos)
 {
   PROTOTYPE  *Proto;