diff --git a/tools/patcher/DiabloUI/patcher.cpp b/tools/patcher/DiabloUI/patcher.cpp
index 68ee68722d9..b8bb6966509 100644
--- a/tools/patcher/DiabloUI/patcher.cpp
+++ b/tools/patcher/DiabloUI/patcher.cpp
@@ -3954,7 +3954,24 @@ static BYTE* patchFile(int index, size_t *dwLen)
 	} break;
 	case FILE_CATHEDRAL_SCEL:
 	{	// patch pSpecialsCel - L1S.CEL
-		buf = DRLP_L1_PatchSpec(buf, dwLen);
+		size_t minLen;
+		BYTE* minBuf = LoadFileInMem(filesToPatch[FILE_CATHEDRAL_MIN], &minLen);
+		if (minBuf == NULL) {
+			mem_free_dbg(buf);
+			app_warn("Unable to open file %s in the mpq.", filesToPatch[FILE_CATHEDRAL_MIN]);
+			return NULL;
+		}
+		size_t celLen;
+		BYTE* celBuf = LoadFileInMem(filesToPatch[FILE_CATHEDRAL_CEL], &celLen);
+		if (celBuf == NULL) {
+			mem_free_dbg(minBuf);
+			mem_free_dbg(buf);
+			app_warn("Unable to open file %s in the mpq.", filesToPatch[FILE_CATHEDRAL_CEL]);
+			return NULL;
+		}
+		buf = DRLP_L1_PatchSpec(minBuf, minLen, celBuf, celLen, buf, dwLen);
+		mem_free_dbg(celBuf);
+		mem_free_dbg(minBuf);
 	} break;
 	case FILE_CATHEDRAL_CEL:
 	{	// patch dMicroCels - L1.CEL
diff --git a/tools/patcher/drlp_l1.cpp b/tools/patcher/drlp_l1.cpp
index fbcd853bd09..346f48aa548 100644
--- a/tools/patcher/drlp_l1.cpp
+++ b/tools/patcher/drlp_l1.cpp
@@ -142,7 +142,7 @@ BYTE* DRLP_L1_PatchDoors(BYTE* celBuf, size_t* celLen)
 	return resCelBuf;
 }
 
-BYTE* DRLP_L1_PatchSpec(BYTE* sCelBuf, size_t* sCelLen)
+BYTE* DRLP_L1_PatchSpec(const BYTE* minBuf, size_t minLen, const BYTE* celBuf, size_t celLen, BYTE* sCelBuf, size_t* sCelLen)
 {
 	constexpr BYTE TRANS_COLOR = 128;
 	constexpr BYTE SUB_HEADER_SIZE = 10;
diff --git a/tools/patcher/drlp_l1.h b/tools/patcher/drlp_l1.h
index aee68466bad..7153d3ed63f 100644
--- a/tools/patcher/drlp_l1.h
+++ b/tools/patcher/drlp_l1.h
@@ -15,7 +15,7 @@ extern "C" {
 #define BLOCK_SIZE_L1 10
 
 BYTE* DRLP_L1_PatchDoors(BYTE* celBuf, size_t* celLen);
-BYTE* DRLP_L1_PatchSpec(BYTE* sCelBuf, size_t* sCelLen);
+BYTE* DRLP_L1_PatchSpec(const BYTE* minBuf, size_t minLen, const BYTE* celBuf, size_t celLen, BYTE* sCelBuf, size_t* sCelLen);
 BYTE* DRLP_L1_PatchCel(const BYTE* minBuf, size_t minLen, BYTE* celBuf, size_t* celLen);
 void DRLP_L1_PatchMin(BYTE* minBuf);
 void DRLP_L1_PatchTil(BYTE* tilBuf);