diff --git a/libpurgeablemem/c/src/purgeable_mem_c.c b/libpurgeablemem/c/src/purgeable_mem_c.c
index e1a08fee34d2c2e1301cc682ff7b0f593e6d0253..3a333aa6111fbec7d54816ffc86e6e17042248bd 100644
--- a/libpurgeablemem/c/src/purgeable_mem_c.c
+++ b/libpurgeablemem/c/src/purgeable_mem_c.c
@@ -61,6 +61,7 @@ static inline size_t RoundUp(size_t val, size_t align)
 
 static bool IsPurgMemPtrValid(struct PurgMem *purgObj);
 static bool IsPurged(struct PurgMem *purgObj);
+static int TypeCast(void);
 
 static struct PurgMem *PurgMemCreate_(size_t len, struct PurgMemBuilder *builder)
 {
@@ -72,9 +73,7 @@ static struct PurgMem *PurgMemCreate_(size_t len, struct PurgMemBuilder *builder
         return NULL;
     }
     size_t size = RoundUp(len, PAGE_SIZE);
-    unsigned int utype = MAP_ANONYMOUS;
-    utype |= (UxpteIsEnabled() ? MAP_PURGEABLE : MAP_PRIVATE);
-    int type = (int) utype;
+    int type = TypeCast();
     pugObj->dataPtr = mmap(NULL, size, PROT_READ | PROT_WRITE, type, -1, 0);
     if (pugObj->dataPtr == MAP_FAILED) {
         PM_HILOG_ERROR_C(LOG_CORE, "%{public}s: mmap dataPtr fail", __func__);
@@ -432,3 +431,11 @@ static bool IsPurged(struct PurgMem *purgObj)
     }
     return !UxpteIsPresent(purgObj->uxPageTable, (uint64_t)(purgObj->dataPtr), purgObj->dataSizeInput);
 }
+
+static int TypeCast(void)
+{
+    unsigned int utype = MAP_ANONYMOUS;
+    utype |= (UxpteIsEnabled() ? MAP_PURGEABLE : MAP_PRIVATE);
+    int type = (int) utype;
+    return type;
+}
\ No newline at end of file