diff --git a/src/apps/debugger/arch/x86_64/ArchitectureX8664.cpp b/src/apps/debugger/arch/x86_64/ArchitectureX8664.cpp
index 0922808fc1..73bd4a5651 100644
--- a/src/apps/debugger/arch/x86_64/ArchitectureX8664.cpp
+++ b/src/apps/debugger/arch/x86_64/ArchitectureX8664.cpp
@@ -315,8 +315,8 @@ ArchitectureX8664::CreateStackFrame(Image* image, FunctionDebugInfo* function,
 
 		// The syscall stubs are frameless, the return address is on top of the
 		// stack.
-		uint32 rsp = cpuState->IntRegisterValue(X86_64_REGISTER_RSP);
-		uint32 address;
+		uint64 rsp = cpuState->IntRegisterValue(X86_64_REGISTER_RSP);
+		uint64 address;
 		if (fTeamMemory->ReadMemory(rsp, &address, 8) == 8) {
 			returnAddress = address;
 			previousFramePointer = framePointer;