diff --git a/changelogs/unreleased/1368-dark64 b/changelogs/unreleased/1368-dark64
new file mode 100644
index 00000000..00fe5cf4
--- /dev/null
+++ b/changelogs/unreleased/1368-dark64
@@ -0,0 +1 @@
+Fix staticcall input/output size in `addition` & `scalar_mul`
\ No newline at end of file
diff --git a/zokrates_proof_systems/src/solidity.rs b/zokrates_proof_systems/src/solidity.rs
index f30e27f8..bc698548 100644
--- a/zokrates_proof_systems/src/solidity.rs
+++ b/zokrates_proof_systems/src/solidity.rs
@@ -456,7 +456,7 @@ library Pairing {
         input[3] = p2.Y;
         bool success;
         assembly {
-            success := staticcall(sub(gas(), 2000), 6, input, 0xc0, r, 0x60)
+            success := staticcall(sub(gas(), 2000), 6, input, 0x80, r, 0x40)
             // Use "invalid" to make gas estimation work
             switch success case 0 { invalid() }
         }
@@ -481,7 +481,7 @@ library Pairing {
         input[2] = s;
         bool success;
         assembly {
-            success := staticcall(sub(gas(), 2000), 7, input, 0x80, r, 0x60)
+            success := staticcall(sub(gas(), 2000), 7, input, 0x60, r, 0x40)
             // Use "invalid" to make gas estimation work
             switch success case 0 { invalid() }
         }