diff --git a/amalgamation/xgboost-all0.cc b/amalgamation/xgboost-all0.cc
index 5f7e75fd9d7f..f758e50e7dad 100644
--- a/amalgamation/xgboost-all0.cc
+++ b/amalgamation/xgboost-all0.cc
@@ -75,7 +75,6 @@
 #include "../src/common/json.cc"
 #include "../src/common/io.cc"
 #include "../src/common/survival_util.cc"
-#include "../src/common/probability_distribution.cc"
 #include "../src/common/version.cc"
 
 // c_api