--- a/generic/tclsqlite3.c
+++ b/generic/tclsqlite3.c
@@ -73,6 +73,7 @@
 #   endif
 # endif /* SQLITE_PTRSIZE */
 # if defined(HAVE_STDINT_H)
+#   include <stdint.h>
     typedef uintptr_t uptr;
 # elif SQLITE_PTRSIZE==4
     typedef unsigned int uptr;