diff --git a/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp b/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
index c02ef4a1c39..b1a0956bac5 100644
--- a/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
+++ b/lib/Target/WebAssembly/WebAssemblyRuntimeLibcallSignatures.cpp
@@ -400,6 +400,12 @@ RuntimeLibcallSignatures[RTLIB::UNKNOWN_LIBCALL] = {
 /* MEMCPY_ELEMENT_ATOMIC_8 */ iPTR_func_iPTR_iPTR_iPTR,
 /* MEMCPY_ELEMENT_ATOMIC_16 */ iPTR_func_iPTR_iPTR_iPTR,
 
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_1 */ unsupported,
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_2 */ unsupported,
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_4 */ unsupported,
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_8 */ unsupported,
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_16 */ unsupported,
+
 // EXCEPTION HANDLING
 /* UNWIND_RESUME */ unsupported,
 
@@ -844,6 +850,11 @@ RuntimeLibcallNames[RTLIB::UNKNOWN_LIBCALL] = {
 /* MEMCPY_ELEMENT_ATOMIC_4 */ "MEMCPY_ELEMENT_ATOMIC_4",
 /* MEMCPY_ELEMENT_ATOMIC_8 */ "MEMCPY_ELEMENT_ATOMIC_8",
 /* MEMCPY_ELEMENT_ATOMIC_16 */ "MEMCPY_ELEMENT_ATOMIC_16",
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_1 */ nullptr,
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_2 */ nullptr,
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_4 */ nullptr,
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_8 */ nullptr,
+/* MEMMOVE_ELEMENT_UNORDERED_ATOMIC_16 */ nullptr,
 /* UNWIND_RESUME */ "_Unwind_Resume",
 /* SYNC_VAL_COMPARE_AND_SWAP_1 */ "__sync_val_compare_and_swap_1",
 /* SYNC_VAL_COMPARE_AND_SWAP_2 */ "__sync_val_compare_and_swap_2",