diff -up rsyslog-8.2102.0/parse.h.orig rsyslog-8.2102.0/parse.h
--- rsyslog-8.2102.0/parse.h.orig	2023-05-09 09:10:09.236597063 +0200
+++ rsyslog-8.2102.0/parse.h	2023-05-09 09:10:26.913608034 +0200
@@ -56,7 +56,7 @@ struct rsParsObject
 	rsObjID OID;			/**< object ID */
 #endif
 	cstr_t *pCStr;		/**< pointer to the string object we are parsing */
-	int iCurrPos;			/**< current parsing position (char offset) */
+	size_t iCurrPos;			/**< current parsing position (char offset) */
 };
 typedef struct rsParsObject rsParsObj;
 
diff -up rsyslog-8.2102.0/runtime/stream.c.orig rsyslog-8.2102.0/runtime/stream.c
--- rsyslog-8.2102.0/runtime/stream.c.orig	2023-05-09 09:10:34.122612508 +0200
+++ rsyslog-8.2102.0/runtime/stream.c	2023-05-09 09:12:47.934640583 +0200
@@ -1071,7 +1071,7 @@ strmReadMultiLine(strm_t *pThis, cstr_t
 	cstr_t *thisLine = NULL;
 	rsRetVal readCharRet;
 	const time_t tCurr = pThis->readTimeout ? getTime(NULL) : 0;
-	int maxMsgSize = glblGetMaxLine();
+	size_t maxMsgSize = glblGetMaxLine();
 	DEFiRet;
 
 	do {
@@ -1132,9 +1132,9 @@ strmReadMultiLine(strm_t *pThis, cstr_t
 					}
 
 
-					int currLineLen = cstrLen(thisLine);
+					size_t currLineLen = cstrLen(thisLine);
 					if(currLineLen > 0) {
-						int len;
+						size_t len;
 						if((len = cstrLen(pThis->prevMsgSegment) + currLineLen) <
 						maxMsgSize) {
 							CHKiRet(cstrAppendCStr(pThis->prevMsgSegment, thisLine));
@@ -1144,7 +1144,7 @@ strmReadMultiLine(strm_t *pThis, cstr_t
 								len = 0;
 							} else {
 								len = currLineLen-(len-maxMsgSize);
-								for(int z=0; z<len; z++) {
+								for(size_t z=0; z<len; z++) {
 									cstrAppendChar(pThis->prevMsgSegment,
 										thisLine->pBuf[z]);
 								}
diff -up rsyslog-8.2102.0/runtime/stringbuf.c.orig rsyslog-8.2102.0/runtime/stringbuf.c
--- rsyslog-8.2102.0/runtime/stringbuf.c.orig	2023-05-09 09:09:37.627577446 +0200
+++ rsyslog-8.2102.0/runtime/stringbuf.c	2023-05-09 09:09:59.061590749 +0200
@@ -474,7 +474,7 @@ finalize_it:
  * This is due to performance reasons.
  */
 #ifndef NDEBUG
-int cstrLen(cstr_t *pThis)
+size_t cstrLen(cstr_t *pThis)
 {
 	rsCHECKVALIDOBJECT(pThis, OIDrsCStr);
 	return(pThis->iStrLen);
diff -up rsyslog-8.2102.0/runtime/stringbuf.h.orig rsyslog-8.2102.0/runtime/stringbuf.h
--- rsyslog-8.2102.0/runtime/stringbuf.h.orig	2023-05-09 09:08:05.199520082 +0200
+++ rsyslog-8.2102.0/runtime/stringbuf.h	2023-05-09 09:09:26.924570803 +0200
@@ -144,9 +144,9 @@ rsRetVal cstrAppendCStr(cstr_t *pThis, c
 
 /* now come inline-like functions */
 #ifdef NDEBUG
-#	define cstrLen(x) ((int)((x)->iStrLen))
+#	define cstrLen(x) ((size_t)((x)->iStrLen))
 #else
-	int cstrLen(cstr_t *pThis);
+	size_t cstrLen(cstr_t *pThis);
 #endif
 #define rsCStrLen(s) cstrLen((s))