diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -4507,8 +4507,9 @@
         }
         Assert(NumArgs->equalsInt(NumPreallocatedArgs),
                "llvm.call.preallocated.setup arg size must be equal to number "
-               "of arguments "
-               "at call site");
+               "of preallocated arguments "
+               "at call site",
+               Call, *UseCall);
         // getOperandBundle() cannot be called if more than one of the operand
         // bundle exists. There is already a check elsewhere for this, so skip
         // here if we see more than one.
diff --git a/llvm/test/Verifier/preallocated-invalid.ll b/llvm/test/Verifier/preallocated-invalid.ll
--- a/llvm/test/Verifier/preallocated-invalid.ll
+++ b/llvm/test/Verifier/preallocated-invalid.ll
@@ -98,7 +98,7 @@
     ret void
 }
 
-; CHECK: arg size must be equal to number of arguments
+; CHECK: arg size must be equal to number of preallocated arguments
 define void @preallocated_num_args() {
     %cs = call token @llvm.call.preallocated.setup(i32 3)
     %x = call i8* @llvm.call.preallocated.arg(token %cs, i32 0) preallocated(i32)