diff -up rsyslog-3.21.10/runtime/stringbuf.c.convVar rsyslog-3.21.10/runtime/stringbuf.c
--- rsyslog-3.21.10/runtime/stringbuf.c.convVar	2009-03-13 21:32:55.000000000 +0100
+++ rsyslog-3.21.10/runtime/stringbuf.c	2009-03-13 21:39:09.000000000 +0100
@@ -820,7 +820,7 @@ rsCStrConvertToNumber(cstr_t *pStr, numb
 	/* TODO: octal? hex? */
 	n = 0;
 	while(i < pStr->iStrLen && isdigit(pStr->pBuf[i])) {
-		n = n * 10 + pStr->pBuf[i] * 10;
+		n = n * 10 + pStr->pBuf[i] - '0';
 		++i;
 	}
 	
diff -up rsyslog-3.21.10/runtime/var.c.convVar rsyslog-3.21.10/runtime/var.c
--- rsyslog-3.21.10/runtime/var.c.convVar	2009-03-13 00:31:48.000000000 +0100
+++ rsyslog-3.21.10/runtime/var.c	2009-03-13 00:44:51.000000000 +0100
@@ -366,7 +366,7 @@ ConvForOperation(var_t *pThis, var_t *pO
 				case VARTYPE_NUMBER:
 					/* check if we can convert pThis to a number, if so use number format. */
 					iRet = ConvToNumber(pThis);
-					if(iRet != RS_RET_NOT_A_NUMBER) {
+					if(iRet == RS_RET_NOT_A_NUMBER) {
 						CHKiRet(ConvToString(pOther));
 					} else {
 						FINALIZE; /* OK or error */
@@ -384,7 +384,7 @@ ConvForOperation(var_t *pThis, var_t *pO
 					break;
 				case VARTYPE_STR:
 					iRet = ConvToNumber(pOther);
-					if(iRet != RS_RET_NOT_A_NUMBER) {
+					if(iRet == RS_RET_NOT_A_NUMBER) {
 						CHKiRet(ConvToString(pThis));
 					} else {
 						FINALIZE; /* OK or error */