diff --git a/tests-clar/clar.c b/tests-clar/clar.c
index 5189e7919..6c7399a54 100644
--- a/tests-clar/clar.c
+++ b/tests-clar/clar.c
@@ -468,7 +468,7 @@ void clar__assert_equal(
 			}
 		}
 	}
-	else if (!strcmp(PRIuZ, fmt) || !strcmp(PRIxZ, fmt)) {
+	else if (!strcmp("%"PRIuZ, fmt) || !strcmp("%"PRIxZ, fmt)) {
 		size_t sz1 = va_arg(args, size_t), sz2 = va_arg(args, size_t);
 		is_equal = (sz1 == sz2);
 		if (!is_equal) {
diff --git a/tests-clar/clar.h b/tests-clar/clar.h
index e1f244eba..c40bc7ac9 100644
--- a/tests-clar/clar.h
+++ b/tests-clar/clar.h
@@ -68,6 +68,7 @@ void cl_fixture_cleanup(const char *fixture_name);
 
 #define cl_assert_equal_p(p1,p2) clar__assert_equal(__FILE__,__LINE__,"Pointer mismatch: " #p1 " != " #p2, 1, "%p", (p1), (p2))
 
+#define cl_assert_equal_sz(sz1,sz2) clar__assert_equal(__FILE__,__LINE__,#sz1 " != " #sz2, 1, "%"PRIuZ, (size_t)(sz1), (size_t)(sz2))
 
 void clar__fail(
 	const char *file,
diff --git a/tests-clar/clar_libgit2.h b/tests-clar/clar_libgit2.h
index 3cb0607f1..8dcfdee48 100644
--- a/tests-clar/clar_libgit2.h
+++ b/tests-clar/clar_libgit2.h
@@ -32,8 +32,6 @@ void cl_git_report_failure(int, const char *, int, const char *);
 #define cl_assert_at_line(expr,file,line) \
 	clar__assert((expr) != 0, file, line, "Expression is not true: " #expr, NULL, 1)
 
-#define cl_assert_equal_sz(sz1,sz2) clar__assert_equal(__FILE__,__LINE__,#sz1 " != " #sz2, 1, PRIuZ, (size_t)(sz1), (size_t)(sz2))
-
 GIT_INLINE(void) clar__assert_in_range(
 	int lo, int val, int hi,
 	const char *file, int line, const char *err, int should_abort)