diff --git a/src/core/loader/loader.h b/src/core/loader/loader.h
index 8de95dacf..a7f2715ba 100644
--- a/src/core/loader/loader.h
+++ b/src/core/loader/loader.h
@@ -71,6 +71,7 @@ enum class ResultStatus {
     ErrorNotUsed,
     ErrorAlreadyLoaded,
     ErrorMemoryAllocationFailed,
+    ErrorEncrypted,
 };
 
 static inline u32 MakeMagic(char a, char b, char c, char d) {
diff --git a/src/core/loader/ncch.cpp b/src/core/loader/ncch.cpp
index 094d74100..c67d25b55 100644
--- a/src/core/loader/ncch.cpp
+++ b/src/core/loader/ncch.cpp
@@ -266,6 +266,11 @@ ResultStatus AppLoader_NCCH::Load() {
     LOG_DEBUG(Loader, "Thread priority:             0x%X"  , priority);
     LOG_DEBUG(Loader, "Resource limit category:     %d"    , resource_limit_category);
 
+    if (exheader_header.arm11_system_local_caps.program_id != ncch_header.program_id) {
+        LOG_ERROR(Loader, "ExHeader Program ID mismatch: the ROM is probably encrypted.");
+        return ResultStatus::ErrorEncrypted;
+    }
+
     // Read ExeFS...
 
     exefs_offset = ncch_header.exefs_offset * kBlockSize;
diff --git a/src/core/loader/ncch.h b/src/core/loader/ncch.h
index d875e4cf3..fd7c65814 100644
--- a/src/core/loader/ncch.h
+++ b/src/core/loader/ncch.h
@@ -23,7 +23,7 @@ struct NCCH_Header {
     u16 maker_code;
     u16 version;
     u8 reserved_0[4];
-    u8 program_id[8];
+    u64_le program_id;
     u8 reserved_1[0x10];
     u8 logo_region_hash[0x20];
     u8 product_code[0x10];
@@ -109,7 +109,7 @@ struct ExHeader_StorageInfo {
 };
 
 struct ExHeader_ARM11_SystemLocalCaps {
-    u8 program_id[8];
+    u64_le program_id;
     u32 core_version;
     u8 reserved_flags[2];
     union {