diff --git a/src/Reporter.cc b/src/Reporter.cc
index 47950735c4..81da38db7b 100644
--- a/src/Reporter.cc
+++ b/src/Reporter.cc
@@ -203,6 +203,14 @@ void Reporter::CPPRuntimeError(const char* fmt, ...) {
     throw InterpreterException();
 }
 
+void Reporter::CPPRuntimeWarning(const char* fmt, ...) {
+    va_list ap;
+    va_start(ap, fmt);
+    FILE* out = EmitToStderr(warnings_to_stderr) ? stderr : nullptr;
+    DoLog("runtime warning in compiled code", reporter_error, out, nullptr, nullptr, true, true, "", fmt, ap);
+    va_end(ap);
+}
+
 void Reporter::InternalError(const char* fmt, ...) {
     va_list ap;
     va_start(ap, fmt);
diff --git a/src/Reporter.h b/src/Reporter.h
index 2107f137ff..d67a68c5a8 100644
--- a/src/Reporter.h
+++ b/src/Reporter.h
@@ -115,6 +115,9 @@ public:
     // function will not return but raise an InterpreterException.
     [[noreturn]] void CPPRuntimeError(const char* fmt, ...) __attribute__((format(printf, 2, 3)));
 
+    // Similar, but for warnings. This function does return.
+    void CPPRuntimeWarning(const char* fmt, ...) __attribute__((format(printf, 2, 3)));
+
     // Report a traffic weirdness, i.e., an unexpected protocol situation
     // that may lead to incorrectly processing a connection.
     void Weird(const char* name, const char* addl = "",