diff --git a/main.cc b/main.cc
index 83a0fc5d0..56e17ce06 100644
--- a/main.cc
+++ b/main.cc
@@ -127,16 +127,7 @@ static BOOL OpenLibs(void) {
 /* global options */
 extern NmapOps o;  /* option structure */
 
-/* A mechanism to save argv[0] for code that requires that. */
-static const char *program_name = NULL;
-
-static void set_program_name(const char *name) {
-  program_name = name;
-}
-
-const char *get_program_name(void) {
-  return program_name;
-}
+extern void set_program_name(const char *name);
 
 int main(int argc, char *argv[]) {
   /* The "real" main is nmap_main().  This function hijacks control at the
diff --git a/nmap.cc b/nmap.cc
index 1d38e5f59..6f20d1a0e 100644
--- a/nmap.cc
+++ b/nmap.cc
@@ -138,12 +138,21 @@ extern char *optarg;
 extern int optind;
 extern NmapOps o;  /* option structure */
 
-/* argv[0] storage from main.cc. */
-extern const char *get_program_name(void);
 static bool target_needs_new_hostgroup(std::vector<Target *> &targets,
   const Target *target);
 static void display_nmap_version();
 
+/* A mechanism to save argv[0] for code that requires that. */
+static const char *program_name = NULL;
+
+void set_program_name(const char *name) {
+  program_name = name;
+}
+
+static const char *get_program_name(void) {
+  return program_name;
+}
+
 /* parse the --scanflags argument.  It can be a number >=0 or a string consisting of TCP flag names like "URGPSHFIN".  Returns -1 if the argument is invalid. */
 static int parse_scanflags(char *arg) {
   int flagval = 0;