diff --git a/src/apps/debugger/dwarf/DwarfFile.cpp b/src/apps/debugger/dwarf/DwarfFile.cpp
index 1ab1208808..519424c879 100644
--- a/src/apps/debugger/dwarf/DwarfFile.cpp
+++ b/src/apps/debugger/dwarf/DwarfFile.cpp
@@ -666,12 +666,14 @@ DwarfFile::UnwindCallFrame(CompilationUnit* unit,
 
 				// read the FDE augmentation data (if any)
 				FDEAugmentation fdeAugmentation;
+				off_t fdeOffset = dataReader.Offset();
 				error = cieAugmentation.ReadFDEData(dataReader,
 					fdeAugmentation);
 				if (error != B_OK) {
 					TRACE_CFI("  failed to read FDE augmentation data!\n");
 					return error;
 				}
+				remaining -= dataReader.Offset() - fdeOffset;
 
 				error = context.SaveInitialRuleSet();
 				if (error != B_OK)