diff --git a/scripts/build/builders/host.py b/scripts/build/builders/host.py
index 3e29938..a599b0f 100644
--- a/scripts/build/builders/host.py
+++ b/scripts/build/builders/host.py
@@ -365,12 +365,14 @@
     def PreBuildCommand(self):
         if self.app == HostApp.TESTS and self.use_coverage:
             self._Execute(['ninja', '-C', self.output_dir, 'default'], title="Build-only")
-            self._Execute(['lcov', '--initial', '--capture', '--directory', os.path.join(self.output_dir, 'obj'), '--exclude', os.path.join(self.chip_dir, 'third_party/*'), '--exclude', '/usr/include/*',
+            self._Execute(['find', os.path.join(self.output_dir, 'obj/src/'), '-depth',
+                          '-name', 'tests', '-exec', 'rm -rf {} \;'], title="Cleanup unit tests")
+            self._Execute(['lcov', '--initial', '--capture', '--directory', os.path.join(self.output_dir, 'obj'), '--exclude', os.path.join(self.chip_dir, 'zzz_generated/*'), '--exclude', os.path.join(self.chip_dir, 'third_party/*'), '--exclude', '/usr/include/*',
                           '--output-file', os.path.join(self.coverage_dir, 'lcov_base.info')], title="Initial coverage baseline")
 
     def PostBuildCommand(self):
         if self.app == HostApp.TESTS and self.use_coverage:
-            self._Execute(['lcov', '--capture', '--directory', os.path.join(self.output_dir, 'obj'), '--exclude', os.path.join(self.chip_dir, 'third_party/*'), '--exclude', '/usr/include/*',
+            self._Execute(['lcov', '--capture', '--directory', os.path.join(self.output_dir, 'obj'), '--exclude', os.path.join(self.chip_dir, 'zzz_generated/*'), '--exclude', os.path.join(self.chip_dir, 'third_party/*'), '--exclude', '/usr/include/*',
                           '--output-file', os.path.join(self.coverage_dir, 'lcov_test.info')], title="Update coverage")
             self._Execute(['lcov', '--add-tracefile', os.path.join(self.coverage_dir, 'lcov_base.info'),
                            '--add-tracefile', os.path.join(self.coverage_dir, 'lcov_test.info'),
diff --git a/scripts/build_coverage.sh b/scripts/build_coverage.sh
index b7223ce..91f5e7f 100755
--- a/scripts/build_coverage.sh
+++ b/scripts/build_coverage.sh
@@ -92,8 +92,11 @@
     ninja -C "$OUTPUT_ROOT" check
 fi
 
+# Remove unit test itself from coverage statistics
+find "$OUTPUT_ROOT/obj/src/" -depth -name 'tests' -exec rm -rf {} \;
+
 mkdir -p "$COVERAGE_ROOT"
-lcov --initial --capture --directory "$OUTPUT_ROOT/obj/src" --exclude="$CHIP_ROOT/third_party/*" --exclude=/usr/include/* --output-file "$COVERAGE_ROOT/lcov_base.info"
-lcov --capture --directory "$OUTPUT_ROOT/obj/src" --exclude="$CHIP_ROOT/third_party/*" --exclude=/usr/include/* --output-file "$COVERAGE_ROOT/lcov_test.info"
+lcov --initial --capture --directory "$OUTPUT_ROOT/obj/src" --exclude="$PWD"/zzz_generated/* --exclude="$PWD"/third_party/* --exclude=/usr/include/* --output-file "$COVERAGE_ROOT/lcov_base.info"
+lcov --capture --directory "$OUTPUT_ROOT/obj/src" --exclude="$PWD"/zzz_generated/* --exclude="$PWD"/third_party/* --exclude=/usr/include/* --output-file "$COVERAGE_ROOT/lcov_test.info"
 lcov --add-tracefile "$COVERAGE_ROOT/lcov_base.info" --add-tracefile "$COVERAGE_ROOT/lcov_test.info" --output-file "$COVERAGE_ROOT/lcov_final.info"
 genhtml "$COVERAGE_ROOT/lcov_final.info" --output-directory "$COVERAGE_ROOT/html"