diff --git a/2dproxy_bin/2dproxy_extractor.sh b/2dproxy_bin/2dproxy_extractor.sh
index 5a248ac..21aba76 100755
--- a/2dproxy_bin/2dproxy_extractor.sh
+++ b/2dproxy_bin/2dproxy_extractor.sh
@@ -105,7 +105,7 @@ fi
 # Constructor bytecode extraction part
 # 
 
-extracted_ctor=$(echo "$orig_bytecode" | sed 's/\(f300\)\(.*\)/\1/')
+extracted_ctor=$(echo "$orig_bytecode" | sed -E 's/(f300|f3fe)(.*)/\1/')
 
 extracted_ctor_size=${#extracted_ctor}
 
diff --git a/2dproxy_bin/truffle/2dproxy_extractor_truffle_ctor.sh b/2dproxy_bin/truffle/2dproxy_extractor_truffle_ctor.sh
index b32d51f..4cd019c 100755
--- a/2dproxy_bin/truffle/2dproxy_extractor_truffle_ctor.sh
+++ b/2dproxy_bin/truffle/2dproxy_extractor_truffle_ctor.sh
@@ -70,7 +70,7 @@ fi
 # Constructor bytecode extraction part
 # 
 
-extracted_ctor=$(echo "$orig_bytecode" | sed 's/\(f300\)\(.*\)/\1/')
+extracted_ctor=$(echo "$orig_bytecode" | sed -E 's/(f300|f3fe)(.*)/\1/')
 
 extracted_ctor_size=${#extracted_ctor}
 
diff --git a/2dproxy_bin/truffle/2dproxy_extractor_truffle_runtime.sh b/2dproxy_bin/truffle/2dproxy_extractor_truffle_runtime.sh
index d923735..e108771 100755
--- a/2dproxy_bin/truffle/2dproxy_extractor_truffle_runtime.sh
+++ b/2dproxy_bin/truffle/2dproxy_extractor_truffle_runtime.sh
@@ -70,7 +70,7 @@ fi
 # Constructor bytecode extraction part
 # 
 
-extracted_ctor=$(echo "$orig_bytecode" | sed 's/\(f300\)\(.*\)/\1/')
+extracted_ctor=$(echo "$orig_bytecode" | sed -E 's/(f300|f3fe)(.*)/\1/')
 
 extracted_ctor_size=${#extracted_ctor}