diff --git a/ext/hbsdctl.rb/feature.c b/ext/hbsdctl.rb/feature.c
index e4a5899..53f9a93 100644
--- a/ext/hbsdctl.rb/feature.c
+++ b/ext/hbsdctl.rb/feature.c
@@ -1,5 +1,6 @@
 #include <libhbsdcontrol.h>
 #include <unistd.h>
+#include <errno.h>
 #include "include/feature.h"
 static VALUE __rb_eError(void);
 static VALUE __set(VALUE, VALUE, VALUE);
@@ -12,15 +13,9 @@ feature_set(VALUE self, VALUE rb_path, VALUE rb_state)
 {
   Check_Type(rb_path, T_STRING);
   Check_Type(rb_state, T_FIXNUM);
-  if (getuid() != 0) {
-    rb_raise(__rb_eError(), "This operation requires root privileges.");
-  } else if (rb_funcall(rb_cFile, rb_intern("exist?"), 1, rb_path) == Qfalse) {
-    rb_raise(__rb_eError(), "The given path does not exist.");
-  } else {
-    VALUE rb_feature = rb_funcall(self, rb_intern("name"), 0);
-    Check_Type(rb_feature, T_STRING);
-    return (__set(rb_path, rb_feature, rb_state));
-  }
+  VALUE rb_feature = rb_funcall(self, rb_intern("name"), 0);
+  Check_Type(rb_feature, T_STRING);
+  return (__set(rb_path, rb_feature, rb_state));
 }
 
 
@@ -35,7 +30,7 @@ __set(VALUE rb_path, VALUE rb_feature, VALUE rb_state)
   if (result == 0) {
     return (Qtrue);
   } else {
-    rb_raise(__rb_eError(), "hbsdcontrol_set_feature_state failed");
+    rb_syserr_fail(errno, "hbsdcontrol_set_feature_state");
   }
 }
 
diff --git a/lib/bsd/control/feature.rb b/lib/bsd/control/feature.rb
index a397e26..a796d87 100644
--- a/lib/bsd/control/feature.rb
+++ b/lib/bsd/control/feature.rb
@@ -16,8 +16,8 @@ module BSD::Control
     # @param [String] path
     #  The path to a file.
     #
-    # @raise [BSD::Control::Error]
-    #  When the operation fails.
+    # @raise [SystemCallError]
+    #  Might raise a number of Errno exceptions.
     #
     # @return [Boolean]
     #  Returns true on success.
@@ -31,8 +31,8 @@ module BSD::Control
     # @param [String] path
     #  The path to a file.
     #
-    # @raise [BSD::Control::Error]
-    #  When the operation fails.
+    # @raise [SystemCallError]
+    #  Might raise a number of Errno exceptions.
     #
     # @return [Boolean]
     #  Returns true on success.
diff --git a/test/superuser/disable_feature_test.rb b/test/superuser/disable_feature_test.rb
new file mode 100644
index 0000000..7ca374e
--- /dev/null
+++ b/test/superuser/disable_feature_test.rb
@@ -0,0 +1,19 @@
+require_relative "../setup"
+module BSD::Control
+  class DisableFeatureTest < Test::Unit::TestCase
+    require 'fileutils'
+    include FileUtils
+
+    def test_disable_mprotect_nonexistent_file
+      assert_raises Errno::ENOENT do
+        BSD::Control.feature(:mprotect).disable!(file)
+      end
+    end
+
+    private
+
+    def file
+      File.join(__dir__, "file")
+    end
+  end
+end
diff --git a/test/superuser/enable_feature_test.rb b/test/superuser/enable_feature_test.rb
index 1213d72..c420fe9 100644
--- a/test/superuser/enable_feature_test.rb
+++ b/test/superuser/enable_feature_test.rb
@@ -22,7 +22,7 @@ module BSD::Control
     end
 
     def test_enable_mprotect_nonexistent_file
-      assert_raises(BSD::Control::Error) do
+      assert_raises(Errno::ENOENT) do
         BSD::Control.feature(:mprotect).enable!(file)
       end
     end
diff --git a/test/unprivileged/disable_feature_test.rb b/test/unprivileged/disable_feature_test.rb
new file mode 100644
index 0000000..11468f0
--- /dev/null
+++ b/test/unprivileged/disable_feature_test.rb
@@ -0,0 +1,19 @@
+require_relative "../setup"
+module BSD::Control
+  class DisableFeatureTest < Test::Unit::TestCase
+    require 'fileutils'
+    include FileUtils
+
+    def test_disable_mprotect_nonexistent_file
+      assert_raises(Errno::ENOENT) do
+        BSD::Control.feature(:mprotect).disable!(file)
+      end
+    end
+
+    private
+
+    def file
+      File.join(__dir__, "file")
+    end
+  end
+end
diff --git a/test/unprivileged/enable_feature_test.rb b/test/unprivileged/enable_feature_test.rb
index 77f264e..f1f6e08 100644
--- a/test/unprivileged/enable_feature_test.rb
+++ b/test/unprivileged/enable_feature_test.rb
@@ -6,10 +6,7 @@ module BSD::Control
 
     def test_enable_feature_lacks_privileges
       touch(file)
-      assert_raises(
-        BSD::Control::Error,
-        "This operation requires root privileges."
-      ) do
+      assert_raises(Errno::EPERM) do
         BSD::Control.feature(:mprotect).enable!(file)
       end
     ensure