diff --git a/src/rt/rust_upcall.cpp b/src/rt/rust_upcall.cpp
index cf8537ad6d0..330b10dc178 100644
--- a/src/rt/rust_upcall.cpp
+++ b/src/rt/rust_upcall.cpp
@@ -27,28 +27,6 @@ upcall_grow_task(rust_task *task, size_t n_frame_bytes) {
     task->grow(n_frame_bytes);
 }
 
-extern "C" CDECL
-void upcall_log_int(rust_task *task, uint32_t level, int32_t i) {
-    LOG_UPCALL_ENTRY(task);
-    if (task->sched->log_lvl >= level)
-        task->sched->log(task, level, "rust: %" PRId32 " (0x%" PRIx32 ")",
-                       i, i);
-}
-
-extern "C" CDECL
-void upcall_log_float(rust_task *task, uint32_t level, float f) {
-    LOG_UPCALL_ENTRY(task);
-    if (task->sched->log_lvl >= level)
-        task->sched->log(task, level, "rust: %12.12f", f);
-}
-
-extern "C" CDECL
-void upcall_log_double(rust_task *task, uint32_t level, double *f) {
-    LOG_UPCALL_ENTRY(task);
-    if (task->sched->log_lvl >= level)
-        task->sched->log(task, level, "rust: %12.12f", *f);
-}
-
 extern "C" CDECL void
 upcall_yield(rust_task *task) {
     LOG_UPCALL_ENTRY(task);
diff --git a/src/rt/rustrt.def.in b/src/rt/rustrt.def.in
index 46916c5ab49..856046a65fc 100644
--- a/src/rt/rustrt.def.in
+++ b/src/rt/rustrt.def.in
@@ -79,9 +79,6 @@ upcall_grow_task
 upcall_vec_grow
 upcall_vec_push
 upcall_kill
-upcall_log_double
-upcall_log_float
-upcall_log_int
 upcall_log_type
 upcall_malloc
 upcall_shared_malloc