diff --git a/src/script_opt/CPP/Util.cc b/src/script_opt/CPP/Util.cc
index 1c64c9af21..f41f225a41 100644
--- a/src/script_opt/CPP/Util.cc
+++ b/src/script_opt/CPP/Util.cc
@@ -1,5 +1,6 @@
 // See the file "COPYING" in the main distribution directory for copyright.
 
+#include "zeek/script_opt/StmtOptInfo.h"
 #include "zeek/script_opt/CPP/Util.h"
 
 #include <errno.h>
@@ -50,6 +51,14 @@ bool is_CPP_compilable(const ProfileFunc* pf, const char** reason)
 		return false;
 		}
 
+	auto body = pf->ProfiledBody();
+	if ( body && ! body->GetOptInfo()->is_free_of_conditionals )
+		{
+		if ( reason )
+			*reason = "body may be affected by @if conditional";
+		return false;
+		}
+
 	return true;
 	}