diff --git a/udev_device.c b/udev_device.c
index df1fb87..9da5117 100644
--- a/udev_device.c
+++ b/udev_device.c
@@ -11,7 +11,6 @@
 
 #include "udev.h"
 #include "udev_list.h"
-#include "udev_device.h"
 
 struct udev_device
 {
@@ -302,7 +301,7 @@ UDEV_EXPORT int udev_device_set_sysattr_value(struct udev_device *udev_device, c
     return 0;
 }
 
-const char *udev_device_read_symlink(struct udev_device *udev_device, const char *name)
+static const char *udev_device_read_symlink(struct udev_device *udev_device, const char *name)
 {
     char link[PATH_MAX], path[PATH_MAX];
 
@@ -315,7 +314,7 @@ const char *udev_device_read_symlink(struct udev_device *udev_device, const char
     return strrchr(link, '/') + 1;
 }
 
-void udev_device_set_properties_from_uevent(struct udev_device *udev_device)
+static void udev_device_set_properties_from_uevent(struct udev_device *udev_device)
 {
     char *key, *val, line[1024], path[PATH_MAX];
     char *sysname, devnode[PATH_MAX];
@@ -379,12 +378,12 @@ void udev_device_set_properties_from_uevent(struct udev_device *udev_device)
     fclose(file);
 }
 
-int test_bit(unsigned long int arr[], int bit)
+static int test_bit(unsigned long int arr[], int bit)
 {
     return arr[bit / LONG_BIT] & (1 << (bit % LONG_BIT));
 }
 
-void udev_device_set_properties_from_ioctl(struct udev_device *udev_device)
+static void udev_device_set_properties_from_ioctl(struct udev_device *udev_device)
 {
     unsigned long int bits[96], key_bits[96], rel_bits[96], abs_bits[96];
     const char *subsystem;
diff --git a/udev_device.h b/udev_device.h
deleted file mode 100644
index ed1b3dd..0000000
--- a/udev_device.h
+++ /dev/null
@@ -1,4 +0,0 @@
-int test_bit(unsigned long int arr[], int bit);
-const char *udev_device_read_symlink(struct udev_device *udev_device, const char *name);
-void udev_device_set_properties_from_uevent(struct udev_device *udev_device);
-void udev_device_set_properties_from_ioctl(struct udev_device *udev_device);
diff --git a/udev_enumerate.c b/udev_enumerate.c
index ae3b187..0f9396b 100644
--- a/udev_enumerate.c
+++ b/udev_enumerate.c
@@ -9,7 +9,6 @@
 
 #include "udev.h"
 #include "udev_list.h"
-#include "udev_enumerate.h"
 
 struct udev_enumerate
 {
@@ -95,7 +94,7 @@ UDEV_EXPORT int udev_enumerate_add_match_is_initialized(struct udev_enumerate *u
     return 0;
 }
 
-int udev_enumerate_filter_subsystem(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device)
+static int udev_enumerate_filter_subsystem(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device)
 {
     struct udev_list_entry *list_entry;
     const char *subsystem;
@@ -132,7 +131,7 @@ int udev_enumerate_filter_subsystem(struct udev_enumerate *udev_enumerate, struc
     return 1;
 }
 
-int udev_enumerate_filter_sysname(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device)
+static int udev_enumerate_filter_sysname(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device)
 {
     struct udev_list_entry *list_entry;
     const char *sysname;
@@ -155,7 +154,7 @@ int udev_enumerate_filter_sysname(struct udev_enumerate *udev_enumerate, struct
     return 0;
 }
 
-int udev_enumerate_filter_property(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device)
+static int udev_enumerate_filter_property(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device)
 {
     const char *property, *property2, *value, *value2;
     struct udev_list_entry *list_entry, *list_entry2;
@@ -198,7 +197,7 @@ int udev_enumerate_filter_property(struct udev_enumerate *udev_enumerate, struct
     return 0;
 }
 
-int udev_enumerate_filter_sysattr(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device)
+static int udev_enumerate_filter_sysattr(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device)
 {
     struct udev_list_entry *list_entry;
     const char *sysattr, *value;
@@ -244,7 +243,7 @@ int udev_enumerate_filter_sysattr(struct udev_enumerate *udev_enumerate, struct
     return 1;
 }
 
-void udev_enumerate_add_device(struct udev_enumerate *udev_enumerate, const char type, dev_t devnum)
+static void udev_enumerate_add_device(struct udev_enumerate *udev_enumerate, const char type, dev_t devnum)
 {
     struct udev_device *udev_device;
 
@@ -266,7 +265,7 @@ void udev_enumerate_add_device(struct udev_enumerate *udev_enumerate, const char
     udev_device_unref(udev_device);
 }
 
-void udev_enumerate_scan_dir(struct udev_enumerate *udev_enumerate, const char *path)
+static void udev_enumerate_scan_dir(struct udev_enumerate *udev_enumerate, const char *path)
 {
     char file[PATH_MAX];
     struct dirent *de;
diff --git a/udev_enumerate.h b/udev_enumerate.h
deleted file mode 100644
index 08a97f9..0000000
--- a/udev_enumerate.h
+++ /dev/null
@@ -1,6 +0,0 @@
-int udev_enumerate_filter_subsystem(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device);
-int udev_enumerate_filter_property(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device);
-int udev_enumerate_filter_sysname(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device);
-int udev_enumerate_filter_sysattr(struct udev_enumerate *udev_enumerate, struct udev_device *udev_device);
-void udev_enumerate_add_device(struct udev_enumerate *udev_enumerate, const char type, dev_t devnum);
-void udev_enumerate_scan_dir(struct udev_enumerate *udev_enumerate, const char *path);