diff --git a/src/p_djgpp2.cpp b/src/p_djgpp2.cpp
index 41f19f45..7bec0ad8 100644
--- a/src/p_djgpp2.cpp
+++ b/src/p_djgpp2.cpp
@@ -300,8 +300,7 @@ void PackDjgpp2::pack(OutputFile *fo)
     text->size = lsize;                   // new size of .text
     data->size = ph.c_len;                // new size of .data
 
-    unsigned stack = 1024 + ph.overlap_overhead +
-                     patchDecompressorGetExtraStacksize();
+    unsigned stack = 1024 + ph.overlap_overhead + getDecompressorWrkmemSize();
     stack = ALIGN_UP(stack, 16);
     if (bss->size < stack)  // give it a .bss
         bss->size = stack;
diff --git a/src/packer.h b/src/packer.h
index 83d6817e..0be2250a 100644
--- a/src/packer.h
+++ b/src/packer.h
@@ -224,8 +224,8 @@ protected:
     const int *getDefaultCompressionMethods_8(int method, int level, int small=-1) const;
     const int *getDefaultCompressionMethods_le32(int method, int level, int small=-1) const;
     virtual const char *getDecompressorSections() const;
+    virtual unsigned getDecompressorWrkmemSize() const;
     virtual void patchDecompressor(void *, int);
-    virtual unsigned patchDecompressorGetExtraStacksize();
 
     // filter handling [see packer_f.cpp]
     virtual bool isValidFilter(int filter_id) const;
diff --git a/src/packer_c.cpp b/src/packer_c.cpp
index 0fc8397e..c2b05e01 100644
--- a/src/packer_c.cpp
+++ b/src/packer_c.cpp
@@ -208,17 +208,18 @@ const char *Packer::getDecompressorSections() const
 }
 
 
-unsigned Packer::patchDecompressorGetExtraStacksize()
+unsigned Packer::getDecompressorWrkmemSize() const
 {
-    unsigned stack = 0;
+    unsigned size = 0;
     if (ph.method == M_LZMA)
     {
         const lzma_compress_result_t *res = &ph.compress_result.result_lzma;
         // FIXME - this is for i386 only
-        stack = 8 + 4 + ALIGN_UP(2 * res->num_probs, 4);
-        stack = ALIGN_UP(stack, 16);
+        size = 8 + 4 + ALIGN_UP(2 * res->num_probs, 4);
+        size = ALIGN_UP(size, 16);
     }
-    return stack;
+    assert((int)size >= 0);
+    return size;
 }
 
 
@@ -235,7 +236,7 @@ void Packer::patchDecompressor(void *loader, int lsize)
         patch_le32(loader, lsize, "UPXd", properties);
         patch_le32(loader, lsize, "UPXc", ph.c_len - 1);
         patch_le32(loader, lsize, "UPXb", ph.u_len);
-        unsigned stack = patchDecompressorGetExtraStacksize();
+        unsigned stack = getDecompressorWrkmemSize();
         patch_le32(loader, lsize, "UPXa", 0u - stack);
     }
 }