diff --git a/src/add-ons/kernel/bus_managers/usb/PhysicalMemoryAllocator.cpp b/src/add-ons/kernel/bus_managers/usb/PhysicalMemoryAllocator.cpp
index 5ef971b325..7ec36484af 100644
--- a/src/add-ons/kernel/bus_managers/usb/PhysicalMemoryAllocator.cpp
+++ b/src/add-ons/kernel/bus_managers/usb/PhysicalMemoryAllocator.cpp
@@ -9,6 +9,7 @@
 #include <malloc.h>
 #include <string.h>
 #include <KernelExport.h>
+#include <SupportDefs.h>
 #include <util/kernel_cpp.h>
 #include "BeOSCompatibility.h"
 #include "PhysicalMemoryAllocator.h"
@@ -133,6 +134,13 @@ PhysicalMemoryAllocator::Allocate(size_t size, void **logicalAddress,
 {
 #ifdef HAIKU_TARGET_PLATFORM_HAIKU
 	if (debug_debugger_running()) {
+		if (size > fDebugChunkSize) {
+			kprintf("usb allocation of %" B_PRIuSIZE
+				" does not fit debug chunk size %" B_PRIuSIZE "!\n",
+				size, fDebugChunkSize);
+			return B_NO_MEMORY;
+		}
+
 		for (int32 i = 0; i < 64; i++) {
 			uint64 mask = 1LL << i;
 			if ((fDebugUseMap & mask) == 0) {