diff --git a/firmware/common/portapack_persistent_memory.cpp b/firmware/common/portapack_persistent_memory.cpp
index 43626d71a..1df1746df 100644
--- a/firmware/common/portapack_persistent_memory.cpp
+++ b/firmware/common/portapack_persistent_memory.cpp
@@ -64,7 +64,7 @@ ppb_t correction_ppb() {
 	return data->correction_ppb;
 }
 
-void set_correction_ppb(ppb_t new_value) {
+void set_correction_ppb(const ppb_t new_value) {
 	data->correction_ppb = ppb_range.clip(new_value);
 }
 
diff --git a/firmware/common/portapack_persistent_memory.hpp b/firmware/common/portapack_persistent_memory.hpp
index db229bdbd..03fd6e6e5 100644
--- a/firmware/common/portapack_persistent_memory.hpp
+++ b/firmware/common/portapack_persistent_memory.hpp
@@ -30,7 +30,7 @@ namespace persistent_memory {
 using ppb_t = int32_t;
 
 ppb_t correction_ppb();
-void set_correction_ppb(ppb_t new_value);
+void set_correction_ppb(const ppb_t new_value);
 
 } /* namespace persistent_memory */
 } /* namespace portapack */