diff --git a/include/utils/Compat.h b/include/utils/Compat.h
index 7d9631027..c5f9d6a80 100644
--- a/include/utils/Compat.h
+++ b/include/utils/Compat.h
@@ -75,4 +75,10 @@ static inline ssize_t pread64(int fd, void* buf, size_t nbytes, off64_t offset)
     _rc; })
 #endif
 
+#if defined(_WIN32)
+#define OS_PATH_SEPARATOR '\\'
+#else
+#define OS_PATH_SEPARATOR '/'
+#endif
+
 #endif /* __LIB_UTILS_COMPAT_H */
diff --git a/libutils/String8.cpp b/libutils/String8.cpp
index 3323b82a5..28be60fb5 100644
--- a/libutils/String8.cpp
+++ b/libutils/String8.cpp
@@ -16,6 +16,7 @@
 
 #include <utils/String8.h>
 
+#include <utils/Compat.h>
 #include <utils/Log.h>
 #include <utils/Unicode.h>
 #include <utils/SharedBuffer.h>