diff --git a/src/cgt/BUILD b/src/cgt/BUILD
index edb7aae3383..63cc91922f1 100644
--- a/src/cgt/BUILD
+++ b/src/cgt/BUILD
@@ -26,6 +26,9 @@ cc_library(
         "include/cgt/NetworkBuilder.h",
         "include/cgt/RandomBits.h",
     ],
+    defines = [
+        "ABC_NAMESPACE=abc",
+    ],
     includes = [
         "include",
     ],
diff --git a/src/cut/BUILD b/src/cut/BUILD
index 2fd86c00bed..b3ae434531f 100644
--- a/src/cut/BUILD
+++ b/src/cut/BUILD
@@ -34,6 +34,9 @@ cc_library(
         "@boost.fusion",
         "@edu_berkeley_abc//:abc-lib",
     ],
-    defines = ["_GLIBCXX_ASSERTIONS"]
+    defines = [
+        "_GLIBCXX_ASSERTIONS",
+        "ABC_NAMESPACE=abc",
+    ],
 )