diff --git a/src/core/linker.cpp b/src/core/linker.cpp
index 37ac657d..9783ad96 100644
--- a/src/core/linker.cpp
+++ b/src/core/linker.cpp
@@ -68,9 +68,17 @@ void Linker::Execute() {
     }
 
     // Configure used flexible memory size.
-    if (auto* mem_param = GetProcParam()->mem_param) {
-        if (u64* flexible_size = mem_param->flexible_memory_size) {
-            memory->SetupMemoryRegions(*flexible_size);
+    if (const auto* proc_param = GetProcParam()) {
+        if (proc_param->size >=
+            offsetof(OrbisProcParam, mem_param) + sizeof(OrbisKernelMemParam*)) {
+            if (const auto* mem_param = proc_param->mem_param) {
+                if (mem_param->size >=
+                    offsetof(OrbisKernelMemParam, flexible_memory_size) + sizeof(u64*)) {
+                    if (const auto* flexible_size = mem_param->flexible_memory_size) {
+                        memory->SetupMemoryRegions(*flexible_size);
+                    }
+                }
+            }
         }
     }