diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 1b40eca..bb18cc2 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -10,12 +10,16 @@ is a safeguard to prevent miscommunication.
 Version 1.2.2 (upcoming)
 ========================
 
+Bugfix version for ``stepgen`` module, which was affected by an error in the ``encoder`` module.
+
 * ``driver``:
 
   * ``encoder``: counts and position of encoder can be reset (#74)
+  * ``encoder``: incorrect required read buffer reported has been corrected. This affected the module ``stepgen`` (#79)
   * ``watchdog``: the watchdog is reset when the card is reset. Prevents the ``has_bitten`` message when LinuxCNC
     is restarted without power-cycling the card. (#80)
 
+
 Version 1.2.1
 =============
 
diff --git a/src/litexcnc/driver/modules/litexcnc_encoder.c b/src/litexcnc/driver/modules/litexcnc_encoder.c
index d092904..7de4c50 100644
--- a/src/litexcnc/driver/modules/litexcnc_encoder.c
+++ b/src/litexcnc/driver/modules/litexcnc_encoder.c
@@ -119,7 +119,7 @@ size_t required_read_buffer(void *instance) {
     // (32 bits). When there are more then 32 encoders, another DWORD is added to the 
     // registers. For each encoder there is also a struct with the number of counts 
     // retrieved.
-    return single_dword_buffer(encoder) + num_instances * sizeof(litexcnc_encoder_instance_read_data_t);
+    return single_dword_buffer(encoder) + encoder->num_instances * sizeof(litexcnc_encoder_instance_read_data_t);
 }