diff --git a/db/exec.c b/db/exec.c
index 8ba4afc88..21b9beef3 100644
--- a/db/exec.c
+++ b/db/exec.c
@@ -58,7 +58,7 @@ u32 db_data_version_get(struct db *db)
 	return version;
 }
 
-void db_set_intvar(struct db *db, char *varname, s64 val)
+void db_set_intvar(struct db *db, const char *varname, s64 val)
 {
 	size_t changes;
 	struct db_stmt *stmt = db_prepare_v2(db, SQL("UPDATE vars SET intval=? WHERE name=?;"));
@@ -77,7 +77,7 @@ void db_set_intvar(struct db *db, char *varname, s64 val)
 	}
 }
 
-s64 db_get_intvar(struct db *db, char *varname, s64 defval)
+s64 db_get_intvar(struct db *db, const char *varname, s64 defval)
 {
 	s64 res = defval;
 	struct db_stmt *stmt = db_prepare_v2(
diff --git a/db/exec.h b/db/exec.h
index 70799532a..e592042d9 100644
--- a/db/exec.h
+++ b/db/exec.h
@@ -13,7 +13,7 @@ struct db;
  * Utility function to store generic integer values in the
  * database.
  */
-void db_set_intvar(struct db *db, char *varname, s64 val);
+void db_set_intvar(struct db *db, const char *varname, s64 val);
 
 /**
  * db_get_intvar - Retrieve an integer variable from the database
@@ -21,7 +21,7 @@ void db_set_intvar(struct db *db, char *varname, s64 val);
  * Either returns the value in the database, or @defval if
  * the query failed or no such variable exists.
  */
-s64 db_get_intvar(struct db *db, char *varname, s64 defval);
+s64 db_get_intvar(struct db *db, const char *varname, s64 defval);
 
 /* Get the current data version (entries). */
 u32 db_data_version_get(struct db *db);
diff --git a/lightningd/test/run-find_my_abspath.c b/lightningd/test/run-find_my_abspath.c
index c09bd0128..bd59df06e 100644
--- a/lightningd/test/run-find_my_abspath.c
+++ b/lightningd/test/run-find_my_abspath.c
@@ -41,7 +41,7 @@ void db_begin_transaction_(struct db *db UNNEEDED, const char *location UNNEEDED
 void db_commit_transaction(struct db *db UNNEEDED)
 { fprintf(stderr, "db_commit_transaction called!\n"); abort(); }
 /* Generated stub for db_get_intvar */
-s64 db_get_intvar(struct db *db UNNEEDED, char *varname UNNEEDED, s64 defval UNNEEDED)
+s64 db_get_intvar(struct db *db UNNEEDED, const char *varname UNNEEDED, s64 defval UNNEEDED)
 { fprintf(stderr, "db_get_intvar called!\n"); abort(); }
 /* Generated stub for db_in_transaction */
 bool db_in_transaction(struct db *db UNNEEDED)