Index: /trunk/src/VBox/Frontends/VBoxManage/VBoxManage.h
===================================================================
--- /trunk/src/VBox/Frontends/VBoxManage/VBoxManage.h	(revision 79795)
+++ /trunk/src/VBox/Frontends/VBoxManage/VBoxManage.h	(revision 79796)
@@ -194,5 +194,5 @@
 RTEXITCODE errorGetOpt(USAGECATEGORY enmCommand, int rc, union RTGETOPTUNION const *pValueUnion);
 RTEXITCODE errorGetOptEx(USAGECATEGORY enmCommand, uint64_t fSubcommandScope, int rc, union RTGETOPTUNION const *pValueUnion);
-RTEXITCODE errorArgument(const char *pszFormat, ...);
+RTEXITCODE errorArgument(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
 
 void printUsageInternal(USAGECATEGORY enmCommand, PRTSTREAM pStrm);