diff --git a/src/main.c b/src/main.c
index 3c75cc3..0e446fe 100644
--- a/src/main.c
+++ b/src/main.c
@@ -148,7 +148,7 @@ main(int argc, char *argv[])
 	return 0;
 }
 
-char*
+static char*
 e1(char *clearText, char key)
 {
 	char *res = (char *)calloc(strlen(clearText) + 1, 1);
@@ -161,7 +161,7 @@ e1(char *clearText, char key)
 	return res;
 }
 
-char*
+static char*
 d1(char *cypher, char key)
 {
 	char *res = (char *)calloc(strlen(cypher) + 1, 1);