diff --git a/src/sinqAxis.h b/src/sinqAxis.h
index 889ce30..68f4cf3 100644
--- a/src/sinqAxis.h
+++ b/src/sinqAxis.h
@@ -474,8 +474,9 @@ asynStatus setAxisParam(A *axis, C *controller, const char *indexName,
             typename std::remove_pointer<decltype(ctrlPtr)>::type;             \
         asynStatus setStatus =                                                 \
             setAxisParam(axis, ctrlPtr, #indexSetterFunction,                  \
-                         &ControllerType::indexSetterFunction, writeValue,     \
-                         __PRETTY_FUNCTION__, __LINE__);                       \
+                         static_cast<int (ControllerType::*)()>(               \
+                             &ControllerType::indexSetterFunction),            \
+                         writeValue, __PRETTY_FUNCTION__, __LINE__);           \
         if (setStatus != asynSuccess)                                          \
             return setStatus;                                                  \
     } while (0)
@@ -540,8 +541,9 @@ asynStatus getAxisParam(A *axis, C *controller, const char *indexName,
             typename std::remove_pointer<decltype(ctrlPtr)>::type;             \
         asynStatus getStatus =                                                 \
             getAxisParam(axis, ctrlPtr, #indexGetterFunction,                  \
-                         &ControllerType::indexGetterFunction, readValue,      \
-                         __PRETTY_FUNCTION__, __LINE__);                       \
+                         static_cast<int (ControllerType::*)()>(               \
+                             &ControllerType::indexGetterFunction),            \
+                         readValue, __PRETTY_FUNCTION__, __LINE__);            \
         if (getStatus != asynSuccess)                                          \
             return getStatus;                                                  \
     } while (0)