diff --git a/minimake/src/minimake.c b/minimake/src/minimake.c
index ff913ab..4368296 100644
--- a/minimake/src/minimake.c
+++ b/minimake/src/minimake.c
@@ -18,14 +18,14 @@
 
 // Static variables
 
-char *program_name;
+static char *program_name;
 
-struct hash_map *variables = NULL;
-struct hash_map *rules = NULL;
+static struct hash_map *variables = NULL;
+static struct hash_map *rules = NULL;
 
 // Keeps track of variables and rules order
-struct list *variables_list = NULL;
-struct list *rules_list = NULL;
+static struct list *variables_list = NULL;
+static struct list *rules_list = NULL;
 
 // ==== Misc ====