diff --git a/app/src/main/java/org/matrix/TEESimulator/interception/keystore/shim/KeyMintSecurityLevelInterceptor.kt b/app/src/main/java/org/matrix/TEESimulator/interception/keystore/shim/KeyMintSecurityLevelInterceptor.kt
index a1117f3..8f4d266 100644
--- a/app/src/main/java/org/matrix/TEESimulator/interception/keystore/shim/KeyMintSecurityLevelInterceptor.kt
+++ b/app/src/main/java/org/matrix/TEESimulator/interception/keystore/shim/KeyMintSecurityLevelInterceptor.kt
@@ -1068,7 +1068,9 @@ private fun KeyMintAttestation.toAuthorizations(
     this.blockMode.forEach { authList.add(createAuth(Tag.BLOCK_MODE, KeyParameterValue.blockMode(it))) }
     this.digest.forEach { authList.add(createAuth(Tag.DIGEST, KeyParameterValue.digest(it))) }
     this.padding.forEach { authList.add(createAuth(Tag.PADDING, KeyParameterValue.paddingMode(it))) }
-    authList.add(createAuth(Tag.KEY_SIZE, KeyParameterValue.integer(this.keySize)))
+    if (this.algorithm != Algorithm.EC || this.ecCurve == null) {
+        authList.add(createAuth(Tag.KEY_SIZE, KeyParameterValue.integer(this.keySize)))
+    }
     if (this.rsaPublicExponent != null) {
         authList.add(createAuth(Tag.RSA_PUBLIC_EXPONENT, KeyParameterValue.longInteger(this.rsaPublicExponent.toLong())))
     }