diff --git a/.github/workflows/cppcheck.yml b/.github/workflows/cppcheck.yml
index 687ca3e..ebb848c 100644
--- a/.github/workflows/cppcheck.yml
+++ b/.github/workflows/cppcheck.yml
@@ -11,5 +11,6 @@ jobs:
       - name: install cppcheck
         run: sudo apt-get install cppcheck
 
-      - name: Prepare for install postgresql
-        run: sudo cppcheck --enable=all --error-exitcode=1 .
+      - name: Execute linter check with cppcheck
+        run: sudo cppcheck --enable=all --inline-suppr --template='{file}:{line},{severity},{id},{message}' --error-exitcode=1 --suppress=missingIncludeSystem --suppress=missingInclude --check-config .
+
diff --git a/.github/workflows/pg11test.yml b/.github/workflows/pg11test.yml
index b1ed02c..ab8b019 100644
--- a/.github/workflows/pg11test.yml
+++ b/.github/workflows/pg11test.yml
@@ -3,7 +3,7 @@ on: [push]
 
 jobs:
   build:
-    name: pg1-test
+    name: pg11-test
     runs-on: ubuntu-latest
     steps:
       - name: Clone postgres repository
diff --git a/README.md b/README.md
index bc47fcc..2792818 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+![pg11-test](https://github.com/percona/pg_stat_monitor/workflows/pg11-test/badge.svg)
+![pg12-test](https://github.com/percona/pg_stat_monitor/workflows/pg12-test/badge.svg)
+![pg13-test](https://github.com/percona/pg_stat_monitor/workflows/pg13-test/badge.svg)
+
 ## What is pg_stat_monitor?
 The **pg_stat_monitor** is a **PostgreSQL Query Performance Monitoring** tool, based on PostgreSQL's contrib module ``pg_stat_statements``. PostgreSQL’s pg_stat_statements provides the basic statistics, which is sometimes not enough. The major shortcoming in pg_stat_statements is that it accumulates all the queries and their statistics and does not provide aggregated statistics nor histogram information. In this case, a user needs to calculate the aggregate which is quite expensive. 
 
diff --git a/pg_stat_monitor.c b/pg_stat_monitor.c
index d5c870a..9831e30 100644
--- a/pg_stat_monitor.c
+++ b/pg_stat_monitor.c
@@ -183,6 +183,7 @@ static uint64 get_query_id(pgssJumbleState *jstate, Query *query);
 /*
  * Module load callback
  */
+// cppcheck-suppress unusedFunction
 void
 _PG_init(void)
 {
@@ -251,6 +252,7 @@ _PG_init(void)
 /*
  * Module unload callback
  */
+// cppcheck-suppress unusedFunction
 void
 _PG_fini(void)
 {
@@ -1140,7 +1142,6 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
 		Datum       values[PG_STAT_STATEMENTS_COLS];
 		bool        nulls[PG_STAT_STATEMENTS_COLS];
 		int		    i = 0;
-		int         len = 0;
 		int		    kind;
 		Counters    tmp;
 		double      stddev;
@@ -1167,6 +1168,7 @@ pg_stat_monitor_internal(FunctionCallInfo fcinfo,
 		}
 		else
 		{
+			int           len  = 0;
 			unsigned char *buf = pgss_qbuf[entry->key.bucket_id];
 			if(read_query(buf, queryid, query_txt) == 0)
 			{