diff --git a/src/common/backend/jack_backend.c b/src/common/backend/jack_backend.c
index 86eb224..286d17a 100644
--- a/src/common/backend/jack_backend.c
+++ b/src/common/backend/jack_backend.c
@@ -44,7 +44,7 @@ static int jack_start(struct jack_backend_t* jack_backend)
     int ret = 0;
     size_t port;
     char port_name[32];
-    char port_name_template[9];
+    char port_name_template[32] = { 0 };
     char const** ports;
     volatile size_t port_id;
     volatile size_t pports = 0;
@@ -57,12 +57,12 @@ static int jack_start(struct jack_backend_t* jack_backend)
     case AUDIO_IN:
         if (jack_backend->autoconnect == CARD)
         {
-            strcpy(port_name_template, "playback_%u");
+            memcpy(port_name_template, "playback_%u", sizeof(port_name_template)-1);
             JackFlags = JackPortIsInput + JackPortIsPhysical;
         }
         else
         {
-            strcpy(port_name_template, "input_%u");
+            memcpy(port_name_template, "input_%u", sizeof(port_name_template)-1);
             JackFlags = JackPortIsInput;
         }
 
@@ -81,12 +81,12 @@ static int jack_start(struct jack_backend_t* jack_backend)
     default: // AUDIO_OUT:
         if (jack_backend->autoconnect == CARD)
         {
-            strcpy(port_name_template, "capture_%u");
+            memcpy(port_name_template, "capture_%u", sizeof(port_name_template)-1);
             JackFlags = JackPortIsOutput + JackPortIsPhysical;
         }
         else
         {
-            strcpy(port_name_template, "output_%u");
+            memcpy(port_name_template, "output_%u", sizeof(port_name_template)-1);
             JackFlags = JackPortIsOutput;
         }