diff --git a/lib/libc/tests/stdio/open_memstream2_test.c b/lib/libc/tests/stdio/open_memstream2_test.c
index 3c9e3ec30eb2..21ea64c7c669 100644
--- a/lib/libc/tests/stdio/open_memstream2_test.c
+++ b/lib/libc/tests/stdio/open_memstream2_test.c
@@ -159,11 +159,11 @@ ATF_TC_BODY(seek_tests, tc)
 #define SEEK_FAIL(offset, whence, error) do {			\
 	errno = 0;						\
 	ATF_REQUIRE_MSG(fseeko(fp, (offset), (whence)) != 0,	\
-	    "fseeko(%s, %s) did not fail, set pos to %jd\n",	\
+	    "fseeko(%s, %s) did not fail, set pos to %jd",	\
 	    __STRING(offset), __STRING(whence),			\
 	    (intmax_t)ftello(fp));				\
 	ATF_REQUIRE_MSG(errno == (error),			\
-	    "fseeko(%s, %s) failed with %d rather than %s\n",	\
+	    "fseeko(%s, %s) failed with %d rather than %s",	\
 	    __STRING(offset), __STRING(whence),	errno,		\
 	    __STRING(error));					\
 } while (0)
@@ -173,7 +173,7 @@ ATF_TC_BODY(seek_tests, tc)
 	    "fseeko(%s, %s) failed: %s",			\
 	    __STRING(offset), __STRING(whence), strerror(errno)); \
 	ATF_REQUIRE_MSG(ftello(fp) == (result),			\
-	    "fseeko(%s, %s) seeked to %jd rather than %s\n",	\
+	    "fseeko(%s, %s) seeked to %jd rather than %s",	\
 	    __STRING(offset), __STRING(whence),			\
 	    (intmax_t)ftello(fp), __STRING(result));		\
 } while (0)
diff --git a/lib/libc/tests/stdio/open_wmemstream_test.c b/lib/libc/tests/stdio/open_wmemstream_test.c
index d6ae2ea88e2c..324bcf3d3482 100644
--- a/lib/libc/tests/stdio/open_wmemstream_test.c
+++ b/lib/libc/tests/stdio/open_wmemstream_test.c
@@ -159,11 +159,11 @@ ATF_TC_BODY(seek_tests, tc)
 #define SEEK_FAIL(offset, whence, error) do {			\
 	errno = 0;						\
 	ATF_REQUIRE_MSG(fseeko(fp, (offset), (whence)) != 0,	\
-	    "fseeko(%s, %s) did not fail, set pos to %jd\n",	\
+	    "fseeko(%s, %s) did not fail, set pos to %jd",	\
 	    __STRING(offset), __STRING(whence),			\
 	    (intmax_t)ftello(fp));				\
 	ATF_REQUIRE_MSG(errno == (error),			\
-	    "fseeko(%s, %s) failed with %d rather than %s\n",	\
+	    "fseeko(%s, %s) failed with %d rather than %s",	\
 	    __STRING(offset), __STRING(whence),	errno,		\
 	    __STRING(error));					\
 } while (0)
@@ -173,7 +173,7 @@ ATF_TC_BODY(seek_tests, tc)
 	    "fseeko(%s, %s) failed: %s",			\
 	    __STRING(offset), __STRING(whence), strerror(errno)); \
 	ATF_REQUIRE_MSG(ftello(fp) == (result),			\
-	    "fseeko(%s, %s) seeked to %jd rather than %s\n",	\
+	    "fseeko(%s, %s) seeked to %jd rather than %s",	\
 	    __STRING(offset), __STRING(whence),			\
 	    (intmax_t)ftello(fp), __STRING(result));		\
 } while (0)