diff --git a/src/database.c b/src/database.c
index be6b678..a94685d 100644
--- a/src/database.c
+++ b/src/database.c
@@ -33,7 +33,7 @@ struct _simdb_t {
 };
 
 /** database header format line */
-const char *simdb_hdr_fmt = "IMDB v%02u, CAPS: %s;";
+static const char *simdb_hdr_fmt = "IMDB v%02u, CAPS: %s;";
 
 bool
 simdb_create(const char *path) {
diff --git a/src/simdb-query.c b/src/simdb-query.c
index dfff711..ebb62ef 100644
--- a/src/simdb-query.c
+++ b/src/simdb-query.c
@@ -15,9 +15,6 @@
  */
 
 #include "common.h"
-#include "bitmap.h"
-#include "record.h"
-#include "io.h"
 #include "simdb.h"
 
 #include <unistd.h>