diff --git a/src/backend_x64/hostloc.cpp b/src/backend_x64/hostloc.cpp
index bc1683af..2093623a 100644
--- a/src/backend_x64/hostloc.cpp
+++ b/src/backend_x64/hostloc.cpp
@@ -11,8 +11,6 @@ namespace BackendX64 {
 
 Xbyak::Reg64 HostLocToReg64(HostLoc loc) {
     DEBUG_ASSERT(HostLocIsGPR(loc));
-    DEBUG_ASSERT(loc != HostLoc::RSP);
-    DEBUG_ASSERT(loc != HostLoc::R15);
     return Xbyak::Reg64(static_cast<int>(loc));
 }
 
diff --git a/src/backend_x64/reg_alloc.cpp b/src/backend_x64/reg_alloc.cpp
index 9800e022..925ed136 100644
--- a/src/backend_x64/reg_alloc.cpp
+++ b/src/backend_x64/reg_alloc.cpp
@@ -34,6 +34,7 @@ static u32 ImmediateToU32(const IR::Value& imm) {
 
 static Xbyak::Reg HostLocToX64(HostLoc hostloc) {
     if (HostLocIsGPR(hostloc)) {
+        DEBUG_ASSERT(hostloc != HostLoc::RSP && hostloc != HostLoc::R15);
         return HostLocToReg64(hostloc);
     }
     if (HostLocIsXMM(hostloc)) {
diff --git a/src/backend_x64/reg_alloc.h b/src/backend_x64/reg_alloc.h
index 565465e6..bfaa412e 100644
--- a/src/backend_x64/reg_alloc.h
+++ b/src/backend_x64/reg_alloc.h
@@ -201,9 +201,11 @@ private:
     };
     std::array<HostLocInfo, HostLocCount> hostloc_info;
     HostLocInfo& LocInfo(HostLoc loc) {
+        DEBUG_ASSERT(loc != HostLoc::RSP && loc != HostLoc::R15);
         return hostloc_info[static_cast<size_t>(loc)];
     }
     const HostLocInfo& LocInfo(HostLoc loc) const {
+        DEBUG_ASSERT(loc != HostLoc::RSP && loc != HostLoc::R15);
         return hostloc_info[static_cast<size_t>(loc)];
     }
 };