diff --git a/TinyGsmClientA6.h b/TinyGsmClientA6.h
index 20ae5de..8303e91 100644
--- a/TinyGsmClientA6.h
+++ b/TinyGsmClientA6.h
@@ -406,7 +406,7 @@ public:
     return waitResponse() == 1;
   }
 
-  void callRedial() {
+  bool callRedial() {
     sendAT(GF("DLST"));
     return waitResponse() == 1;
   }
diff --git a/TinyGsmClientM590.h b/TinyGsmClientM590.h
index 9646da1..23c0c5d 100644
--- a/TinyGsmClientM590.h
+++ b/TinyGsmClientM590.h
@@ -405,7 +405,7 @@ public:
     return waitResponse() == 1;
   }
 
-  void callRedial() TINY_GSM_ATTR_NOT_AVAILABLE;
+  bool callRedial() TINY_GSM_ATTR_NOT_AVAILABLE;
 
   bool callHangup(const String& number) {
     sendAT(GF("H"), number);
diff --git a/TinyGsmClientSIM800.h b/TinyGsmClientSIM800.h
index cddd99f..ac50aec 100644
--- a/TinyGsmClientSIM800.h
+++ b/TinyGsmClientSIM800.h
@@ -498,7 +498,7 @@ public:
     return waitResponse() == 1;
   }
 
-  void callRedial() {
+  bool callRedial() {
     sendAT(GF("DL"));
     return waitResponse() == 1;
   }