diff --git a/src/closefrom.c b/src/closefrom.c
index 087ccad..2df5d03 100644
--- a/src/closefrom.c
+++ b/src/closefrom.c
@@ -79,7 +79,7 @@ sys_close_range(unsigned int fd, unsigned int max_fd, unsigned int flags)
  * Close all file descriptors greater than or equal to lowfd.
  * This is the expensive (fallback) method.
  */
-void
+static void
 closefrom_fallback(int lowfd)
 {
 	long fd, maxfd;
diff --git a/test/funopen.c b/test/funopen.c
index aae558c..2b34f7e 100644
--- a/test/funopen.c
+++ b/test/funopen.c
@@ -37,7 +37,7 @@ struct test_cookie {
 	int index;
 };
 
-int
+static int
 test_readfn(void *cookie, char *buf, int size)
 {
 	struct test_cookie *tc = cookie;
@@ -56,7 +56,7 @@ test_readfn(void *cookie, char *buf, int size)
 	return size;
 }
 
-int
+static int
 test_writefn(void *cookie, const char *buf, int size)
 {
 	struct test_cookie *tc = cookie;
@@ -75,7 +75,7 @@ test_writefn(void *cookie, const char *buf, int size)
 	return size;
 }
 
-off_t
+static off_t
 test_seekfn(void *cookie, off_t offset, int whence)
 {
 	struct test_cookie *tc = cookie;
@@ -95,7 +95,7 @@ test_seekfn(void *cookie, off_t offset, int whence)
 	return tc->index;
 }
 
-int
+static int
 test_closefn(void *cookie)
 {
 	struct test_cookie *tc = cookie;
diff --git a/test/md5.c b/test/md5.c
index d421ab8..bc2ed7d 100644
--- a/test/md5.c
+++ b/test/md5.c
@@ -28,7 +28,7 @@
 #include <md5.h>
 #include <string.h>
 
-void
+static void
 test_md5(const char *digest, const char *string)
 {
 	char result[MD5_DIGEST_STRING_LENGTH];