diff --git a/src/contract/consensus/Makefile b/src/contract/consensus/Makefile
index 754aeed5c..0e344bcb7 100644
--- a/src/contract/consensus/Makefile
+++ b/src/contract/consensus/Makefile
@@ -13,8 +13,8 @@ PROOFS_BIN = $(PROOFS_SRC:=.bin)
 # wasm source files
 WASM_SRC = \
 	$(shell find src -type f) \
-	$(shell find ../../sdk -type f) \
-	$(shell find ../../serial -type f)
+	$(shell find ../../sdk -type f -name '*.rs') \
+	$(shell find ../../serial -type f -name '*.rs')
 
 # wasm contract binary
 WASM_BIN = consensus_contract.wasm
diff --git a/src/contract/dao/Makefile b/src/contract/dao/Makefile
index 5f54bc9c9..db6f68a32 100644
--- a/src/contract/dao/Makefile
+++ b/src/contract/dao/Makefile
@@ -13,8 +13,8 @@ PROOFS_BIN = $(PROOFS_SRC:=.bin)
 # wasm source files
 WASM_SRC = \
 	$(shell find src -type f) \
-	$(shell find ../../sdk -type f) \
-	$(shell find ../../serial -type f)
+	$(shell find ../../sdk -type f -name '*.rs') \
+	$(shell find ../../serial -type f -name '*.rs')
 
 # wasm contract binary
 WASM_BIN = dao_contract.wasm
diff --git a/src/contract/deployooor/Makefile b/src/contract/deployooor/Makefile
index ca2f850f2..489ec5a44 100644
--- a/src/contract/deployooor/Makefile
+++ b/src/contract/deployooor/Makefile
@@ -13,8 +13,8 @@ PROOFS_BIN = $(PROOFS_SRC:=.bin)
 # wasm source files
 WASM_SRC = \
 	$(shell find src -type f) \
-	$(shell find ../../sdk -type f) \
-	$(shell find ../../serial -type f)
+	$(shell find ../../sdk -type f -name '*.rs') \
+	$(shell find ../../serial -type f -name '*.rs')
 
 # wasm contract binary
 WASM_BIN = deployooor_contract.wasm
diff --git a/src/contract/money/Makefile b/src/contract/money/Makefile
index d97dbf82b..9e23fec40 100644
--- a/src/contract/money/Makefile
+++ b/src/contract/money/Makefile
@@ -13,8 +13,8 @@ PROOFS_BIN = $(PROOFS_SRC:=.bin)
 # wasm source files
 WASM_SRC = \
 	$(shell find src -type f) \
-	$(shell find ../../sdk -type f) \
-	$(shell find ../../serial -type f)
+	$(shell find ../../sdk -type f -name '*.rs') \
+	$(shell find ../../serial -type f -name '*.rs')
 
 # wasm contract binary
 WASM_BIN = money_contract.wasm