diff --git a/libfprint/drivers_api.h b/libfprint/drivers_api.h
index 59c7dc65..b13aa671 100644
--- a/libfprint/drivers_api.h
+++ b/libfprint/drivers_api.h
@@ -254,7 +254,6 @@ struct fpi_ssm *fpi_ssm_new(struct fp_dev *dev, ssm_handler_fn handler,
 void fpi_ssm_free(struct fpi_ssm *machine);
 void fpi_ssm_start(struct fpi_ssm *machine, ssm_completed_fn callback);
 void fpi_ssm_start_subsm(struct fpi_ssm *parent, struct fpi_ssm *child);
-int fpi_ssm_has_completed(struct fpi_ssm *machine);
 
 /* for drivers */
 void fpi_ssm_next_state(struct fpi_ssm *machine);
diff --git a/libfprint/fp_internal.h b/libfprint/fp_internal.h
index 4d260eec..197dc95c 100644
--- a/libfprint/fp_internal.h
+++ b/libfprint/fp_internal.h
@@ -370,7 +370,6 @@ struct fpi_ssm *fpi_ssm_new(struct fp_dev *dev, ssm_handler_fn handler,
 void fpi_ssm_free(struct fpi_ssm *machine);
 void fpi_ssm_start(struct fpi_ssm *machine, ssm_completed_fn callback);
 void fpi_ssm_start_subsm(struct fpi_ssm *parent, struct fpi_ssm *child);
-int fpi_ssm_has_completed(struct fpi_ssm *machine);
 
 /* for drivers */
 void fpi_ssm_next_state(struct fpi_ssm *machine);