diff --git a/meson.build b/meson.build
index 9468b67109..184dbf5d24 100644
--- a/meson.build
+++ b/meson.build
@@ -449,9 +449,6 @@ conf.set('_GNU_SOURCE', true)
 conf.set('__SANE_USERSPACE_TYPES__', true)
 conf.set10('HAVE_WSTRINGOP_TRUNCATION', has_wstringop_truncation)
 
-conf.set('SIZEOF_PID_T', cc.sizeof('pid_t', prefix : '#include <sys/types.h>'))
-conf.set('SIZEOF_UID_T', cc.sizeof('uid_t', prefix : '#include <sys/types.h>'))
-conf.set('SIZEOF_GID_T', cc.sizeof('gid_t', prefix : '#include <sys/types.h>'))
 conf.set('SIZEOF_DEV_T', cc.sizeof('dev_t', prefix : '#include <sys/types.h>'))
 conf.set('SIZEOF_INO_T', cc.sizeof('ino_t', prefix : '#include <sys/types.h>'))
 conf.set('SIZEOF_TIME_T', cc.sizeof('time_t', prefix : '#include <sys/time.h>'))
diff --git a/src/basic/format-util.h b/src/basic/format-util.h
index 59622508a3..29fbc947b3 100644
--- a/src/basic/format-util.h
+++ b/src/basic/format-util.h
@@ -5,30 +5,17 @@
 #include <net/if.h>
 #include <stdbool.h>
 
-#if SIZEOF_PID_T == 4
-#  define PID_PRI PRIi32
-#elif SIZEOF_PID_T == 2
-#  define PID_PRI PRIi16
-#else
-#  error Unknown pid_t size
-#endif
+#include "macro.h"
+
+assert_cc(sizeof(pid_t) == sizeof(int32_t));
+#define PID_PRI PRIi32
 #define PID_FMT "%" PID_PRI
 
-#if SIZEOF_UID_T == 4
-#  define UID_FMT "%" PRIu32
-#elif SIZEOF_UID_T == 2
-#  define UID_FMT "%" PRIu16
-#else
-#  error Unknown uid_t size
-#endif
+assert_cc(sizeof(uid_t) == sizeof(uint32_t));
+#define UID_FMT "%" PRIu32
 
-#if SIZEOF_GID_T == 4
-#  define GID_FMT "%" PRIu32
-#elif SIZEOF_GID_T == 2
-#  define GID_FMT "%" PRIu16
-#else
-#  error Unknown gid_t size
-#endif
+assert_cc(sizeof(gid_t) == sizeof(uint32_t));
+#define GID_FMT "%" PRIu32
 
 #if SIZEOF_TIME_T == 8
 #  define PRI_TIME PRIi64
diff --git a/src/basic/process-util.h b/src/basic/process-util.h
index a238b25796..4160af45ba 100644
--- a/src/basic/process-util.h
+++ b/src/basic/process-util.h
@@ -172,7 +172,6 @@ int fork_agent(const char *name, const int except[], size_t n_except, pid_t *pid
 
 int set_oom_score_adjust(int value);
 
-#if SIZEOF_PID_T == 4
 /* The highest possibly (theoretic) pid_t value on this architecture. */
 #define PID_T_MAX ((pid_t) INT32_MAX)
 /* The maximum number of concurrent processes Linux allows on this architecture, as well as the highest valid PID value
@@ -182,12 +181,6 @@ int set_oom_score_adjust(int value);
  * these values are documented in proc(5) we feel quite confident that they are stable enough for the near future at
  * least to define them here too. */
 #define TASKS_MAX 4194303U
-#elif SIZEOF_PID_T == 2
-#define PID_T_MAX ((pid_t) INT16_MAX)
-#define TASKS_MAX 32767U
-#else
-#error "Unknown pid_t size"
-#endif
 
 assert_cc(TASKS_MAX <= (unsigned long) PID_T_MAX);
 
diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
index c751e84253..b45d51f613 100644
--- a/src/core/dbus-manager.c
+++ b/src/core/dbus-manager.c
@@ -1663,7 +1663,7 @@ static int method_lookup_dynamic_user_by_uid(sd_bus_message *message, void *user
         assert(message);
         assert(m);
 
-        assert_cc(sizeof(uid) == sizeof(uint32_t));
+        assert_cc(sizeof(uid_t) == sizeof(uint32_t));
         r = sd_bus_message_read_basic(message, 'u', &uid);
         if (r < 0)
                 return r;
diff --git a/src/test/test-process-util.c b/src/test/test-process-util.c
index 4a3f211658..d78e0544a7 100644
--- a/src/test/test-process-util.c
+++ b/src/test/test-process-util.c
@@ -572,10 +572,8 @@ static void test_pid_to_ptr(void) {
         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MAX)) == INT16_MAX);
         assert_se(PTR_TO_PID(PID_TO_PTR(INT16_MIN)) == INT16_MIN);
 
-#if SIZEOF_PID_T >= 4
         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MAX)) == INT32_MAX);
         assert_se(PTR_TO_PID(PID_TO_PTR(INT32_MIN)) == INT32_MIN);
-#endif
 }
 
 static void test_ioprio_class_from_to_string_one(const char *val, int expected) {