diff --git a/evil-commands.el b/evil-commands.el
index e3af076f..767f189b 100644
--- a/evil-commands.el
+++ b/evil-commands.el
@@ -3759,7 +3759,7 @@ Signal an error if the file does not exist."
     (let ((completions (cons '(nil) evil-state-properties)))
       (when arg
         (cond
-         ((eq flag nil)
+         ((not flag)
           (try-completion arg completions predicate))
          ((eq flag t)
           (all-completions arg completions predicate))
diff --git a/evil-ex.el b/evil-ex.el
index 246aa0d7..597574c2 100644
--- a/evil-ex.el
+++ b/evil-ex.el
@@ -545,7 +545,7 @@ in case of incomplete or unknown commands."
 (defun evil-completion-table-concat (table1 table2)
   (lambda (string pred action)
     (cond
-     ((eq action nil)
+     ((not action)
       (let (matches)
         (dolist (table (list table1 table2) (try-completion string matches))
           (let ((x (try-completion string table pred)))
diff --git a/evil-repeat.el b/evil-repeat.el
index f840fb16..de942866 100644
--- a/evil-repeat.el
+++ b/evil-repeat.el
@@ -250,7 +250,7 @@ Return non-nil if so."
       (evil-emacs-state-p)              ; ... in Emacs state
       (and (evil-mouse-events-p         ; ... mouse events
             (this-command-keys-vector))
-           (eq repeat-type nil))
+           (not repeat-type))
       (minibufferp)))                   ; ... minibuffer activated
 
 (defun evil-repeat-record (info)
diff --git a/evil-tests.el b/evil-tests.el
index f22a6694..5672657a 100644
--- a/evil-tests.el
+++ b/evil-tests.el
@@ -9164,8 +9164,8 @@ parameter set."
                        '((signed-number (sign . 1) (number . 2))))))
       (ert-info ("Lookahead")
         (should (equal (parse "foobar" 'expr) '((list "foo"))))
-        (should (equal (parse "foobaz" 'expr) nil))
-        (should (equal (parse "xxxyyy" 'expr) nil))
+        (should (not (parse "foobaz" 'expr)))
+        (should (not (parse "xxxyyy" 'expr)))
         (should (equal (parse "xxxzzz" 'expr) '((list "xxx")))))
       (ert-info ("Semantic actions")
         (should (equal (parse "1+1" 'expr)
@@ -9295,7 +9295,7 @@ parameter set."
   "Test `evil-filter-list'"
   :tags '(evil util)
   (ert-info ("Return filtered list")
-    (should (equal (evil-filter-list #'null '(nil)) nil))
+    (should (not (evil-filter-list #'null '(nil))))
     (should (equal (evil-filter-list #'null '(nil 1)) '(1)))
     (should (equal (evil-filter-list #'null '(nil 1 2 nil)) '(1 2)))
     (should (equal (evil-filter-list #'null '(nil nil 1)) '(1)))
@@ -9902,7 +9902,7 @@ main(argc, argv) char **argv; {
           (add-hook 'text-mode-hook #'use-german-input-method)
           (evil-test-buffer
            "[]"
-           (should (equal evil-input-method nil))
+           (should (not evil-input-method))
            ("a\"a" [escape])
            "\"[a]"
            (text-mode)