diff --git a/RFM69.cpp b/RFM69.cpp
index 428f011..d30648b 100644
--- a/RFM69.cpp
+++ b/RFM69.cpp
@@ -498,7 +498,9 @@ void RFM69::select() {
   // set RFM69 SPI settings explicitly
   _spi->setDataMode(SPI_MODE0);
   _spi->setBitOrder(MSBFIRST);
-  #if defined(__arm__)
+  #if defined(__STM32F1__)
+    _spi->setClockDivider(SPI_CLOCK_DIV8);
+  #elif defined(__arm__)
     _spi->setClockDivider(SPI_CLOCK_DIV16);
   #else
     _spi->setClockDivider(SPI_CLOCK_DIV2);
diff --git a/RFM69.h b/RFM69.h
index 8e85611..3a9ee34 100644
--- a/RFM69.h
+++ b/RFM69.h
@@ -204,7 +204,7 @@ class RFM69 {
     bool initialize(uint8_t freqBand, uint16_t ID, uint8_t networkID=1);
     void setAddress(uint16_t addr);
     void setNetwork(uint8_t networkID);
-    bool canSend();
+    virtual bool canSend();
     virtual void send(uint16_t toAddress, const void* buffer, uint8_t bufferSize, bool requestACK=false);
     virtual bool sendWithRetry(uint16_t toAddress, const void* buffer, uint8_t bufferSize, uint8_t retries=2, uint8_t retryWaitTime=RFM69_ACK_TIMEOUT);
     virtual bool receiveDone();