diff --git a/config.c b/config.c
index 74d47db8..64caa4ab 100644
--- a/config.c
+++ b/config.c
@@ -20,6 +20,7 @@
 #define LOG_ENABLE_DBG 0
 #include "log.h"
 #include "input.h"
+#include "macros.h"
 #include "tokenize.h"
 #include "util.h"
 #include "wayland.h"
@@ -1111,7 +1112,7 @@ parse_config_file(FILE *f, struct config *conf, const char *path, bool errors_ar
 
         /* Split up into key/value pair + trailing comment */
         char *key_value = strtok(line, "#");
-        char *comment __attribute__((unused)) = strtok(NULL, "\n");
+        char UNUSED *comment = strtok(NULL, "\n");
 
         /* Check for new section */
         if (key_value[0] == '[') {
diff --git a/input.c b/input.c
index 645fa4b3..9c94e2ba 100644
--- a/input.c
+++ b/input.c
@@ -26,6 +26,7 @@
 #include "config.h"
 #include "commands.h"
 #include "keymap.h"
+#include "macros.h"
 #include "quirks.h"
 #include "render.h"
 #include "search.h"
@@ -1116,8 +1117,7 @@ wl_pointer_leave(void *data, struct wl_pointer *wl_pointer,
     } else {
         if (surface != NULL) {
             /* Sway 1.4 sends this event with a NULL surface when we destroy the window */
-            const struct wl_window *win __attribute__((unused))
-                = wl_surface_get_user_data(surface);
+            const struct wl_window UNUSED *win = wl_surface_get_user_data(surface);
             assert(old_moused == win->term);
         }
 
diff --git a/log.c b/log.c
index eff6992d..d47e22ac 100644
--- a/log.c
+++ b/log.c
@@ -79,8 +79,7 @@ _log(enum log_class log_class, const char *module, const char *file, int lineno,
 
 static void
 _sys_log(enum log_class log_class, const char *module,
-         const char *file __attribute__((unused)),
-         int lineno __attribute__((unused)),
+         const char UNUSED *file, int UNUSED lineno,
          const char *fmt, int sys_errno, va_list va)
 {
     if (!do_syslog)
diff --git a/log.h b/log.h
index dfddd765..34713d2a 100644
--- a/log.h
+++ b/log.h
@@ -1,5 +1,6 @@
 #pragma once
 #include <stdbool.h>
+#include "macros.h"
 
 enum log_colorize { LOG_COLORIZE_NEVER, LOG_COLORIZE_ALWAYS, LOG_COLORIZE_AUTO };
 enum log_facility { LOG_FACILITY_USER, LOG_FACILITY_DAEMON };
@@ -11,16 +12,16 @@ void log_deinit(void);
 
 void log_msg(enum log_class log_class, const char *module,
                const char *file, int lineno,
-               const char *fmt, ...) __attribute__((format (printf, 5, 6)));
+               const char *fmt, ...) PRINTF(5);
 
 void log_errno(enum log_class log_class, const char *module,
                const char *file, int lineno,
-               const char *fmt, ...) __attribute__((format (printf, 5, 6)));
+               const char *fmt, ...) PRINTF(5);
 
 void log_errno_provided(
     enum log_class log_class, const char *module,
     const char *file, int lineno, int _errno,
-    const char *fmt, ...) __attribute__((format (printf, 6, 7)));
+    const char *fmt, ...) PRINTF(6);
 
 #define LOG_ERR(fmt, ...)  \
     log_msg(LOG_CLASS_ERROR, LOG_MODULE, __FILE__, __LINE__, fmt, ## __VA_ARGS__)
diff --git a/macros.h b/macros.h
index c8990858..323b3748 100644
--- a/macros.h
+++ b/macros.h
@@ -20,6 +20,12 @@
     #define HAS_BUILTIN(x) 0
 #endif
 
+#if GNUC_AT_LEAST(3, 0) || HAS_ATTRIBUTE(unused) || defined(__TINYC__)
+    #define UNUSED __attribute__((__unused__))
+#else
+    #define UNUSED
+#endif
+
 #if GNUC_AT_LEAST(3, 0) || HAS_ATTRIBUTE(malloc)
     #define MALLOC __attribute__((__malloc__))
 #else
diff --git a/shm.c b/shm.c
index 260694f6..317bc9c9 100644
--- a/shm.c
+++ b/shm.c
@@ -22,6 +22,7 @@
 #define LOG_MODULE "shm"
 #define LOG_ENABLE_DBG 0
 #include "log.h"
+#include "macros.h"
 
 #define TIME_SCROLL 0
 
@@ -398,7 +399,7 @@ static bool
 wrap_buffer(struct wl_shm *shm, struct buffer *buf, off_t new_offset)
 {
     /* We don't allow overlapping offsets */
-    off_t diff __attribute__((unused)) =
+    off_t UNUSED diff =
         new_offset < buf->offset ? buf->offset - new_offset : new_offset - buf->offset;
     assert(diff > buf->size);
 
diff --git a/terminal.c b/terminal.c
index 55ea840e..900f8fae 100644
--- a/terminal.c
+++ b/terminal.c
@@ -1032,7 +1032,7 @@ fdm_shutdown(struct fdm *fdm, int fd, int events, void *data)
     wayl_win_destroy(term->window);
     term->window = NULL;
 
-    struct wayland *wayl __attribute__((unused)) = term->wl;
+    struct wayland *wayl = term->wl;
 
     /*
      * Normally we'd get unmapped when we destroy the Wayland