diff --git a/lib/atoi/strtou_noneg.c b/lib/atoi/strtou_noneg.c
index 96a0b530e2..71cacbd1e8 100644
--- a/lib/atoi/strtou_noneg.c
+++ b/lib/atoi/strtou_noneg.c
@@ -11,6 +11,3 @@
 
 extern inline uintmax_t strtou_noneg(const char *s, char **restrict endp,
     int base, uintmax_t min, uintmax_t max, int *restrict status);
-
-extern inline unsigned long strtoul_noneg(const char *s,
-    char **restrict endp, int base);
diff --git a/lib/atoi/strtou_noneg.h b/lib/atoi/strtou_noneg.h
index c9411d0ea2..6d77adf5ec 100644
--- a/lib/atoi/strtou_noneg.h
+++ b/lib/atoi/strtou_noneg.h
@@ -9,8 +9,8 @@
 #include <config.h>
 
 #include <errno.h>
+#include <stddef.h>
 #include <stdint.h>
-#include <stdlib.h>
 
 #include "atoi/strtoi.h"
 #include "attr.h"
@@ -20,10 +20,6 @@ ATTR_STRING(1) ATTR_ACCESS(write_only, 2) ATTR_ACCESS(write_only, 6)
 inline uintmax_t strtou_noneg(const char *s, char **restrict endp,
     int base, uintmax_t min, uintmax_t max, int *restrict status);
 
-ATTR_STRING(1) ATTR_ACCESS(write_only, 2)
-inline unsigned long strtoul_noneg(const char *s,
-    char **restrict endp, int base);
-
 
 inline uintmax_t
 strtou_noneg(const char *s, char **restrict endp, int base,
@@ -40,15 +36,4 @@ strtou_noneg(const char *s, char **restrict endp, int base,
 }
 
 
-inline unsigned long
-strtoul_noneg(const char *s, char **restrict endp, int base)
-{
-	if (strtol(s, endp, base) < 0) {
-		errno = ERANGE;
-		return 0;
-	}
-	return strtoul(s, endp, base);
-}
-
-
 #endif  // include guard
diff --git a/tests/unit/Makefile.am b/tests/unit/Makefile.am
index ff882b8d48..3153538dc6 100644
--- a/tests/unit/Makefile.am
+++ b/tests/unit/Makefile.am
@@ -6,7 +6,6 @@ TESTS = $(check_PROGRAMS)
 check_PROGRAMS = \
     test_adds \
     test_atoi_strtoi \
-    test_atoi_strtou_noneg \
     test_chkname \
     test_sprintf \
     test_strncpy \
@@ -47,19 +46,6 @@ test_atoi_strtoi_LDADD = \
     $(CMOCKA_LIBS) \
     $(NULL)
 
-test_atoi_strtou_noneg_SOURCES = \
-    ../../lib/atoi/strtou_noneg.c \
-    test_atoi_strtou_noneg.c \
-    $(NULL)
-test_atoi_strtou_noneg_CFLAGS = \
-    $(AM_CFLAGS) \
-    $(NULL)
-test_atoi_strtou_noneg_LDFLAGS = \
-    $(NULL)
-test_atoi_strtou_noneg_LDADD = \
-    $(CMOCKA_LIBS) \
-    $(NULL)
-
 test_chkname_SOURCES = \
     ../../lib/chkname.c \
     test_chkname.c \
diff --git a/tests/unit/test_atoi_strtou_noneg.c b/tests/unit/test_atoi_strtou_noneg.c
deleted file mode 100644
index 60631210db..0000000000
--- a/tests/unit/test_atoi_strtou_noneg.c
+++ /dev/null
@@ -1,52 +0,0 @@
-// SPDX-FileCopyrightText: 2023-2024, Alejandro Colomar <alx@kernel.org>
-// SPDX-License-Identifier: BSD-3-Clause
-
-
-#include <errno.h>
-#include <limits.h>
-#include <stddef.h>
-#include <stdlib.h>
-
-#include <stdarg.h>  // Required by <cmocka.h>
-#include <stddef.h>  // Required by <cmocka.h>
-#include <setjmp.h>  // Required by <cmocka.h>
-#include <stdint.h>  // Required by <cmocka.h>
-#include <cmocka.h>
-
-#include "atoi/strtou_noneg.h"
-
-
-static void test_strtoul_noneg(void **state);
-
-
-int
-main(void)
-{
-    const struct CMUnitTest  tests[] = {
-        cmocka_unit_test(test_strtoul_noneg),
-    };
-
-    return cmocka_run_group_tests(tests, NULL, NULL);
-}
-
-
-static void
-test_strtoul_noneg(void **state)
-{
-	errno = 0;
-	assert_true(strtoul_noneg("42", NULL, 0) == 42);
-	assert_true(errno == 0);
-
-	assert_true(strtoul_noneg("-1", NULL, 0) == 0);
-	assert_true(errno == ERANGE);
-	errno = 0;
-	assert_true(strtoul_noneg("-3", NULL, 0) == 0);
-	assert_true(errno == ERANGE);
-	errno = 0;
-	assert_true(strtoul_noneg("-0xFFFFFFFFFFFFFFFF", NULL, 0) == 0);
-	assert_true(errno == ERANGE);
-
-	errno = 0;
-	assert_true(strtoul_noneg("-0x10000000000000000", NULL, 0) == 0);
-	assert_true(errno == ERANGE);
-}