diff --git a/src/IridiumSBD.cpp b/src/IridiumSBD.cpp
index 6b9ed81..7b2176e 100644
--- a/src/IridiumSBD.cpp
+++ b/src/IridiumSBD.cpp
@@ -25,9 +25,14 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include <time.h>
 #include "IridiumSBD.h"
 
-bool ISBDCallback() __attribute__((weak)) { return true; }
-void ISBDConsoleCallback(IridiumSBD *device, char c) __attribute__((weak)) { }
-void ISBDDiagsCallback(IridiumSBD *device, char c) __attribute__((weak)) { }
+
+bool ISBDCallback() __attribute__((weak));
+void ISBDConsoleCallback(IridiumSBD *device, char c) __attribute__((weak));
+void ISBDDiagsCallback(IridiumSBD *device, char c) __attribute__((weak));
+
+bool ISBDCallback() { return true; }
+void ISBDConsoleCallback(IridiumSBD *device, char c) { }
+void ISBDDiagsCallback(IridiumSBD *device, char c) { }
 
 // Power on the RockBLOCK or return from sleep
 int IridiumSBD::begin()
@@ -277,7 +282,7 @@ int IridiumSBD::internalBegin()
    }
 
    // The usual initialization sequence
-   FlashString strings[3] = { F("ATE1\r"), F("AT&D0\r"), F("AT&K0\r") };
+   const char *strings[3] = { "ATE1\r", "AT&D0\r", "AT&K0\r" };
    for (int i=0; i<3; ++i)
    {
       send(strings[i]); 
diff --git a/src/IridiumSBD.h b/src/IridiumSBD.h
index 8e8ad2b..be7c017 100644
--- a/src/IridiumSBD.h
+++ b/src/IridiumSBD.h
@@ -158,4 +158,3 @@ class IridiumSBD
    int filteredavailable();
    int filteredread();
 };
-