diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9ff8fef..35b5a8a 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -59,7 +59,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v3
         with:
-          go-version: '^1.13'
+          go-version: ${{ matrix.go }}
 
       - name: Print Go environment
         id: go-env
diff --git a/ants.go b/ants.go
index 6205cde..18b3dc8 100644
--- a/ants.go
+++ b/ants.go
@@ -82,7 +82,9 @@ var (
 		return 1
 	}()
 
-	defaultLogger = Logger(log.New(os.Stderr, "[ants]: ", log.LstdFlags|log.Lmsgprefix|log.Lmicroseconds))
+	// log.Lmsgprefix is not available in go1.13, just make an identical value for it.
+	logLmsgprefix = 64
+	defaultLogger = Logger(log.New(os.Stderr, "[ants]: ", log.LstdFlags|logLmsgprefix|log.Lmicroseconds))
 
 	// Init an instance pool when importing ants.
 	defaultAntsPool, _ = NewPool(DefaultAntsPoolSize)