diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h b/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
index fff60c96f632f..a941de927688f 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_internal_defs.h
@@ -187,10 +187,11 @@ typedef long pid_t;
 typedef int pid_t;
 #endif
 
-#if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_APPLE ||             \
+#if SANITIZER_FREEBSD || SANITIZER_NETBSD || SANITIZER_APPLE ||           \
     (SANITIZER_SOLARIS && (defined(_LP64) || _FILE_OFFSET_BITS == 64)) || \
     (SANITIZER_LINUX && !SANITIZER_GLIBC && !SANITIZER_ANDROID) ||        \
-    (SANITIZER_LINUX && (defined(__x86_64__) || defined(__hexagon__)))
+    (SANITIZER_LINUX && (defined(__x86_64__) || defined(__hexagon__))) || \
+    SANITIZER_WASI
 typedef u64 OFF_T;
 #else
 typedef uptr OFF_T;