diff --git a/sway/config.c b/sway/config.c
index 76b9ec084..9fcb4617a 100644
--- a/sway/config.c
+++ b/sway/config.c
@@ -359,7 +359,7 @@ static char *get_config_path(void) {
 	snprintf(config_home_fallback, size_fallback, "%s/.config", home);
 
 	const char *config_home = getenv("XDG_CONFIG_HOME");
-	if (config_home == NULL || config_home[0] == '\0') {
+	if (!config_home || config_home[0] == '\0') {
 		config_home = config_home_fallback;
 	}
 
@@ -396,7 +396,7 @@ static char *get_config_path(void) {
 
 static bool load_config(const char *path, struct sway_config *config,
 		struct swaynag_instance *swaynag) {
-	if (path == NULL) {
+	if (!path) {
 		sway_log(SWAY_ERROR, "Unable to find a config file!");
 		return false;
 	}
@@ -432,13 +432,13 @@ bool load_main_config(const char *file, bool is_active, bool validating) {
 	} else {
 		path = get_config_path();
 	}
-	if (path == NULL) {
+	if (!path) {
 		sway_log(SWAY_ERROR, "Cannot find config file");
 		return false;
 	}
 
 	char *real_path = realpath(path, NULL);
-	if (real_path == NULL) {
+	if (!real_path) {
 		sway_log(SWAY_ERROR, "%s not found", path);
 		free(path);
 		return false;
@@ -596,7 +596,7 @@ static bool load_include_config(const char *path, const char *parent_dir,
 	char *real_path = realpath(full_path, NULL);
 	free(full_path);
 
-	if (real_path == NULL) {
+	if (!real_path) {
 		sway_log(SWAY_DEBUG, "%s not found.", path);
 		return false;
 	}
@@ -771,7 +771,7 @@ bool read_config(FILE *file, struct sway_config *config,
 	bool reading_main_config = false;
 	char *this_config = NULL;
 	size_t config_size = 0;
-	if (config->current_config == NULL) {
+	if (!config->current_config) {
 		reading_main_config = true;
 
 		int ret_seek = fseek(file, 0, SEEK_END);
@@ -784,7 +784,7 @@ bool read_config(FILE *file, struct sway_config *config,
 		rewind(file);
 
 		config->current_config = this_config = calloc(1, config_size + 1);
-		if (this_config == NULL) {
+		if (!this_config) {
 			sway_log(SWAY_ERROR, "Unable to allocate buffer for config contents");
 			return false;
 		}
diff --git a/sway/config/bar.c b/sway/config/bar.c
index 767534a69..ed3099172 100644
--- a/sway/config/bar.c
+++ b/sway/config/bar.c
@@ -200,7 +200,7 @@ static void invoke_swaybar(struct bar_config *bar) {
 	}
 
 	bar->client = wl_client_create(server.wl_display, sockets[0]);
-	if (bar->client == NULL) {
+	if (!bar->client) {
 		sway_log_errno(SWAY_ERROR, "wl_client_create failed");
 		return;
 	}
diff --git a/sway/config/input.c b/sway/config/input.c
index a998e1704..2c30ea88f 100644
--- a/sway/config/input.c
+++ b/sway/config/input.c
@@ -235,7 +235,7 @@ static bool validate_type_on_existing(struct input_config *type_wildcard,
 		char **error) {
 	for (int i = 0; i < config->input_configs->length; i++) {
 		struct input_config *ic = config->input_configs->items[i];
-		if (ic->input_type == NULL) {
+		if (!ic->input_type) {
 			continue;
 		}
 
@@ -253,7 +253,7 @@ static bool validate_type_on_existing(struct input_config *type_wildcard,
 static void merge_type_on_existing(struct input_config *type_wildcard) {
 	for (int i = 0; i < config->input_configs->length; i++) {
 		struct input_config *ic = config->input_configs->items[i];
-		if (ic->input_type == NULL) {
+		if (!ic->input_type) {
 			continue;
 		}
 
diff --git a/sway/config/output.c b/sway/config/output.c
index 7d0ed3954..980d4133c 100644
--- a/sway/config/output.c
+++ b/sway/config/output.c
@@ -46,11 +46,11 @@ const char *sway_output_scale_filter_to_string(enum scale_filter_mode scale_filt
 
 struct output_config *new_output_config(const char *name) {
 	struct output_config *oc = calloc(1, sizeof(struct output_config));
-	if (oc == NULL) {
+	if (!oc) {
 		return NULL;
 	}
 	oc->name = strdup(name);
-	if (oc->name == NULL) {
+	if (!oc->name) {
 		free(oc);
 		return NULL;
 	}
@@ -256,7 +256,7 @@ static void set_mode(struct wlr_output *output, int width, int height,
 				best = mode;
 				break;
 			}
-			if (best == NULL || mode->refresh > best->refresh) {
+			if (!best || mode->refresh > best->refresh) {
 				best = mode;
 			}
 		}
@@ -690,7 +690,7 @@ static bool _spawn_swaybg(char **command) {
 	}
 
 	config->swaybg_client = wl_client_create(server.wl_display, sockets[0]);
-	if (config->swaybg_client == NULL) {
+	if (!config->swaybg_client) {
 		sway_log_errno(SWAY_ERROR, "wl_client_create failed");
 		return false;
 	}
diff --git a/sway/config/seat.c b/sway/config/seat.c
index 84260aa39..30ac649f6 100644
--- a/sway/config/seat.c
+++ b/sway/config/seat.c
@@ -185,7 +185,7 @@ void merge_seat_config(struct seat_config *dest, struct seat_config *source) {
 
 struct seat_config *copy_seat_config(struct seat_config *seat) {
 	struct seat_config *copy = new_seat_config(seat->name);
-	if (copy == NULL) {
+	if (!copy) {
 		return NULL;
 	}