diff --git a/tests/buf/oom.c b/tests/buf/oom.c
index 16a03cc..c01e878 100644
--- a/tests/buf/oom.c
+++ b/tests/buf/oom.c
@@ -12,7 +12,7 @@
 #if defined(GIT_ARCH_64) && defined(__linux__)
 # define TOOBIG 0x0fffffffffffffff
 #elif defined(__linux__)
-# define TOOBIG 0x0fffffff
+# define TOOBIG 0xffffff00
 #elif defined(GIT_ARCH_64)
 # define TOOBIG 0xffffffffffffff00
 #else