diff --git a/mars/comm/android/getprocessname.c b/mars/comm/android/getprocessname.c
index 192dee6b9..8d180ab2c 100644
--- a/mars/comm/android/getprocessname.c
+++ b/mars/comm/android/getprocessname.c
@@ -20,7 +20,7 @@ const char* getprocessname() {
     if (x)
         return x;
 
-    sprintf(data, "/proc/%d/cmdline", getpid());
+    snprintf(data, sizeof(data), "/proc/%d/cmdline", getpid());
     fp = fopen(data, "r");
     if (fp) {
         x = fgets(data, 1024, fp);