1 files changed, 4 insertions, 2 deletions

diff --git a/src/CommandOutput.cpp b/src/CommandOutput.cpp
index c221682a1..48a695969 100644
--- a/src/CommandOutput.cpp
+++ b/src/CommandOutput.cpp
@@ -16,9 +16,11 @@
 void cCommandOutputCallback::Out(const char * a_Fmt, ...)
 {
 	AString Output;
-	va_list args;
+	va_list args, argsCopy;
 	va_start(args, a_Fmt);
-	AppendVPrintf(Output, a_Fmt, args);
+	va_start(argsCopy, a_Fmt);
+	AppendVPrintf(Output, a_Fmt, args, argsCopy);
+	va_end(argsCopy);
 	va_end(args);
 	Output.append("\n");
 	Out(Output);