diff --git a/src/genkey.c b/src/genkey.c
index 68be37c..cc1752c 100644
--- a/src/genkey.c
+++ b/src/genkey.c
@@ -1,6 +1,6 @@
 #include <sodium.h>
 
-void dumpkey(FILE* f, unsigned char * name, unsigned char * key, unsigned int keylen) {
+void dump_key_as_c_code(FILE* f, const char * name, unsigned char * key, unsigned int keylen) {
 	fprintf(f, "const unsigned char %s[] = { ", name);
 	for(int i=0; i < keylen; i++) {
 		fprintf(f, "0x%02x", key[i]);
@@ -12,9 +12,9 @@ void dumpkey(FILE* f, unsigned char * name, unsigned char * key, unsigned int ke
 	fprintf(f, "const unsigned int %s_length = %d;\n", name, keylen);
 }
 
-void write_key_files(unsigned char * filebase, unsigned char * varname, unsigned char * key, unsigned int keylen) {
-	unsigned char header_filename[4096];
-	unsigned char raw_filename[4096];
+void write_key_files(const char * filebase, const char * varname, unsigned char * key, unsigned int keylen) {
+	char header_filename[4096];
+	char raw_filename[4096];
 
        	sprintf(header_filename, "%s.h", filebase);
        	sprintf(raw_filename, "%s.raw", filebase);
@@ -27,7 +27,7 @@ void write_key_files(unsigned char * filebase, unsigned char * varname, unsigned
 	}
 
 	// write key as C code
-	dumpkey(hfile, varname, key, keylen);
+	dump_key_as_c_code(hfile, varname, key, keylen);
 
 	// close header file
 	fclose(hfile);