diff --git a/src/modules/Si443x/Si4430.h b/src/modules/Si443x/Si4430.h
index 2d212e05..e7923687 100644
--- a/src/modules/Si443x/Si4430.h
+++ b/src/modules/Si443x/Si4430.h
@@ -35,7 +35,7 @@ class Si4430: public Si4432 {
       \param preambleLen Preamble Length in bits. Defaults to 16 bits.
       \returns \ref status_codes
     */
-    int16_t begin(float freq = 434.0, float br = 4.8, float freqDev = 5.0, float rxBw = 181.1, int8_t power = 10, uint8_t preambleLen = 16);
+    int16_t begin(float freq = 434.0, float br = 4.8, float freqDev = 5.0, float rxBw = 181.1, int8_t power = 10, uint8_t preambleLen = 16) override;
 
     // configuration methods
 
diff --git a/src/modules/Si443x/Si4431.h b/src/modules/Si443x/Si4431.h
index a8939ea1..9eddc268 100644
--- a/src/modules/Si443x/Si4431.h
+++ b/src/modules/Si443x/Si4431.h
@@ -35,7 +35,7 @@ class Si4431: public Si4432 {
       \param preambleLen Preamble Length in bits. Defaults to 16 bits.
       \returns \ref status_codes
     */
-    int16_t begin(float freq = 434.0, float br = 4.8, float freqDev = 5.0, float rxBw = 181.1, int8_t power = 10, uint8_t preambleLen = 16);
+    int16_t begin(float freq = 434.0, float br = 4.8, float freqDev = 5.0, float rxBw = 181.1, int8_t power = 10, uint8_t preambleLen = 16) override;
 
     // configuration methods
 
diff --git a/src/modules/Si443x/Si4432.h b/src/modules/Si443x/Si4432.h
index f3ac0661..8bfe3101 100644
--- a/src/modules/Si443x/Si4432.h
+++ b/src/modules/Si443x/Si4432.h
@@ -35,7 +35,7 @@ class Si4432: public Si443x {
       \param preambleLen Preamble Length in bits. Defaults to 16 bits.
       \returns \ref status_codes
     */
-    int16_t begin(float freq = 434.0, float br = 4.8, float freqDev = 5.0, float rxBw = 181.1, int8_t power = 10, uint8_t preambleLen = 16);
+    virtual int16_t begin(float freq = 434.0, float br = 4.8, float freqDev = 5.0, float rxBw = 181.1, int8_t power = 10, uint8_t preambleLen = 16);
 
     // configuration methods