diff --git a/libpurgeablemem/test/purgeableashmem_test.cpp b/libpurgeablemem/test/purgeableashmem_test.cpp
index 25b017e10ac4446f5aa9e9b554b5a8c1edd0a473..2b057bd3d33090ff05f66f895d644f542cb697af 100644
--- a/libpurgeablemem/test/purgeableashmem_test.cpp
+++ b/libpurgeablemem/test/purgeableashmem_test.cpp
@@ -446,7 +446,7 @@ HWTEST_F(PurgeableAshmemTest, MutiPageReadWriteTest, TestSize.Level1)
 HWTEST_F(PurgeableAshmemTest, MutiMorePageReadWriteTest, TestSize.Level1)
 {
     size_t size = 5 * 1024 * 1024;
-    char *alphabet = (char *)malloc(size);
+    char *alphabet = static_cast<char *>(malloc(size));
     size_t len = 0;
     for (char ch = 'D'; len < size;) {
         alphabet[len++] = ch;
@@ -487,7 +487,7 @@ HWTEST_F(PurgeableAshmemTest, MutiMorePageReadWriteTest, TestSize.Level1)
 HWTEST_F(PurgeableAshmemTest, StableMutiMorePageReadWriteTest, TestSize.Level1)
 {
     size_t size = 5 * 1024 * 1024;
-    char *alphabet = (char *)malloc(size);
+    char *alphabet = static_cast<char *>(malloc(size));
     size_t len = 0;
     for (char ch = 'D'; len < size;) {
         alphabet[len++] = ch;