diff --git a/tests/r7rs-tests.scm b/tests/r7rs-tests.scm
index 88a6289e..939a9621 100644
--- a/tests/r7rs-tests.scm
+++ b/tests/r7rs-tests.scm
@@ -1179,8 +1179,8 @@
 (test "ßa" (string-downcase "ßa"))
 (test "ssa" (string-downcase "SSA"))
 (test "İ" (string-upcase "İ"))
-(test "i̇" (string-downcase "İ"))
-(test "i̇" (string-foldcase "İ"))
+(test "i\x0307;" (string-downcase "İ"))
+(test "i\x0307;" (string-foldcase "İ"))
 (test "J̌" (string-upcase "ǰ"))
 
 ;; context-sensitive (final sigma)