diff --git a/tool/bssl_bm.h b/tool/bssl_bm.h
index 247e36886e..2671b162f6 100644
--- a/tool/bssl_bm.h
+++ b/tool/bssl_bm.h
@@ -30,8 +30,10 @@
 #if defined(INTERNAL_TOOL)
 #include <../crypto/ec_extra/internal.h>
 #include <../crypto/trust_token/internal.h>
+#if defined(FIPS_ENTROPY_SOURCE_JITTER_CPU)
 #include "../third_party/jitterentropy/jitterentropy.h"
-#endif
+#endif // FIPS_ENTROPY_SOURCE_JITTER_CPU
+#endif // INTERNAL_TOOL
 
 #define BM_NAMESPACE bssl
 #define BM_ECDSA_size(key) ECDSA_size(key)