diff --git a/zokrates_stdlib/stdlib/hashes/mimc7/mimc7.zok b/zokrates_stdlib/stdlib/hashes/mimc7/mimc7.zok
index dd7cbded7..d547105ca 100644
--- a/zokrates_stdlib/stdlib/hashes/mimc7/mimc7.zok
+++ b/zokrates_stdlib/stdlib/hashes/mimc7/mimc7.zok
@@ -1,3 +1,5 @@
+#pragma curve bn128;
+
 const field[91] C = [
     0,
     20888961410941983456478427210666206549300505294776164667214940546594746570981,
diff --git a/zokrates_stdlib/stdlib/hashes/mimcSponge/mimcFeistel.zok b/zokrates_stdlib/stdlib/hashes/mimcSponge/mimcFeistel.zok
index f887ce738..f1bc1ae6a 100644
--- a/zokrates_stdlib/stdlib/hashes/mimcSponge/mimcFeistel.zok
+++ b/zokrates_stdlib/stdlib/hashes/mimcSponge/mimcFeistel.zok
@@ -1,3 +1,4 @@
+#pragma curve bn128;
 // MiMCFeistel configured with 220 rounds
 
 const u32 R = 220;
diff --git a/zokrates_stdlib/stdlib/hashes/poseidon/constants.zok b/zokrates_stdlib/stdlib/hashes/poseidon/constants.zok
index 5800127a0..6f349cd24 100644
--- a/zokrates_stdlib/stdlib/hashes/poseidon/constants.zok
+++ b/zokrates_stdlib/stdlib/hashes/poseidon/constants.zok
@@ -1,3 +1,5 @@
+#pragma curve bn128;
+
 const field[6][497] POSEIDON_C = [
     [
       4417881134626180770308697923359573201005643519861877412381846989312604493735,