diff --git a/cores/rp2040/malloc-lock.cpp b/cores/rp2040/malloc-lock.cpp
index 8cf0b9660..6474aa826 100644
--- a/cores/rp2040/malloc-lock.cpp
+++ b/cores/rp2040/malloc-lock.cpp
@@ -76,10 +76,13 @@ extern "C" void *pcalloc(size_t count, size_t size) {
 #else
 // No PSRAM, always fail
 extern "C" void *pmalloc(size_t size) {
+    (void) size;
     return nullptr;
 }
 
 extern "C" void *pcalloc(size_t count, size_t size) {
+    (void) count;
+    (void) size;
     return nullptr;
 }
 #endif