diff --git a/runtime/druntime/src/ldc/sanitizer_common.d b/runtime/druntime/src/ldc/sanitizer_common.d
deleted file mode 100644
index 67513c33d2..0000000000
--- a/runtime/druntime/src/ldc/sanitizer_common.d
+++ /dev/null
@@ -1,36 +0,0 @@
-  /**
- * Contains forward references to LLVM's sanitizers interface.
- * See compiler-rt/include/sanitizer/common_interface_defs.h
- *
- * Copyright: Authors 2019-2019
- * License:   $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost License 1.0)
- * Authors:   LDC Developers
- */
-module ldc.sanitizer_common;
-
-@system:
-@nogc:
-nothrow:
-extern (C):
-
-// Fiber annotation interface.
-// Before switching to a different stack, one must call
-// __sanitizer_start_switch_fiber with a pointer to the bottom of the
-// destination stack and its size. When code starts running on the new stack,
-// it must call __sanitizer_finish_switch_fiber to finalize the switch.
-// The start_switch function takes a void** to store the current fake stack if
-// there is one (it is needed when detect_stack_use_after_return is enabled).
-// When restoring a stack, this pointer must be given to the finish_switch
-// function. In most cases, this void* can be stored on the stack just before
-// switching.  When leaving a fiber definitely, null must be passed as first
-// argument to the start_switch function so that the fake stack is destroyed.
-// If you do not want support for stack use-after-return detection, you can
-// always pass null to these two functions.
-// Note that the fake stack mechanism is disabled during fiber switch, so if a
-// signal callback runs during the switch, it will not benefit from the stack
-// use-after-return detection.
-void __sanitizer_start_switch_fiber(void** fake_stack_save,
-                                    const(void)* bottom, size_t size);
-void __sanitizer_finish_switch_fiber(void* fake_stack_save,
-                                     const(void)** bottom_old,
-                                     size_t* size_old);
diff --git a/runtime/druntime/src/ldc/sanitizers_optionally_linked.d b/runtime/druntime/src/ldc/sanitizers_optionally_linked.d
index 69ba15ffed..f6feefb96f 100644
--- a/runtime/druntime/src/ldc/sanitizers_optionally_linked.d
+++ b/runtime/druntime/src/ldc/sanitizers_optionally_linked.d
@@ -26,6 +26,7 @@ version (SupportSanitizers)
     }
 
     // Forward declarations of sanitizer functions (only ELF supports optional static linking).
+    // See compiler-rt/include/sanitizer/common_interface_defs.h for documentation of these functions.
     extern(C) @system @nogc nothrow
     {
         version (ELF)