diff --git a/Makefile b/Makefile
index dabf2f98..11a6140f 100644
--- a/Makefile
+++ b/Makefile
@@ -82,13 +82,16 @@ clean:
 	rm -rf $(TOOLS) mdbx_test @* *.[ao] *.[ls]o *~ tmp.db/* *.gcov *.log *.err src/*.o test/*.o
 
 check:	all
-	rm -f $(TESTDB) $(TESTLOG) && (set -o pipefail; ./mdbx_test --pathname=$(TESTDB) --dont-cleanup-after basic | tee -a $(TESTLOG) | tail -n 42) && ./mdbx_chk -vvn $(TESTDB)
+	rm -f $(TESTDB) $(TESTLOG) && (set -o pipefail; ./mdbx_test --pathname=$(TESTDB) --dont-cleanup-after basic | tee -a $(TESTLOG) | tail -n 42) \
+	&& ./mdbx_chk -vvn $(TESTDB) && ./mdbx_chk -vvn $(TESTDB)-copy
 
 check-singleprocess:	all
-	rm -f $(TESTDB) $(TESTLOG) && (set -o pipefail; ./mdbx_test --pathname=$(TESTDB) --dont-cleanup-after --hill | tee -a $(TESTLOG) | tail -n 42) && ./mdbx_chk -vvn $(TESTDB)
+	rm -f $(TESTDB) $(TESTLOG) && (set -o pipefail; ./mdbx_test --pathname=$(TESTDB) --dont-cleanup-after --hill | tee -a $(TESTLOG) | tail -n 42) \
+	&& ./mdbx_chk -vvn $(TESTDB) && ./mdbx_chk -vvn $(TESTDB)-copy
 
 check-fault:	all
-	rm -f $(TESTDB) $(TESTLOG) && (set -o pipefail; ./mdbx_test --pathname=$(TESTDB) --inject-writefault=42 --dump-config --dont-cleanup-after basic | tee -a $(TESTLOG) | tail -n 42) && ./mdbx_chk -vvn $(TESTDB)
+	rm -f $(TESTDB) $(TESTLOG) && (set -o pipefail; ./mdbx_test --pathname=$(TESTDB) --inject-writefault=42 --dump-config --dont-cleanup-after basic | tee -a $(TESTLOG) | tail -n 42) \
+	&& ./mdbx_chk -vvn $(TESTDB) && ./mdbx_chk -vvn $(TESTDB)-copy
 
 define core-rule
 $(patsubst %.c,%.o,$(1)): $(1) $(CORE_INC) mdbx.h Makefile
diff --git a/test/gc.sh b/test/gc.sh
index be6991a4..76c7a9a5 100755
--- a/test/gc.sh
+++ b/test/gc.sh
@@ -25,6 +25,7 @@ function probe {
 	rm -f ${TESTDB_PREFIX}* \
 		&& ./mdbx_test --pathname=${TESTDB_PREFIX}db "$@" | lz4 > ${TESTDB_PREFIX}log.lz4 \
 		&& ./mdbx_chk -nvvv ${TESTDB_PREFIX}db | tee ${TESTDB_PREFIX}chk \
+		&& ./mdbx_chk -nvvv ${TESTDB_PREFIX}db-copy | tee ${TESTDB_PREFIX}chk-copy \
 		|| (echo "FAILED"; exit 1)
 }