diff --git a/src/secp256k1/configure.ac b/src/secp256k1/configure.ac
--- a/src/secp256k1/configure.ac
+++ b/src/secp256k1/configure.ac
@@ -503,7 +503,7 @@
 AM_CONDITIONAL([ENABLE_MODULE_MULTISET], [test x"$enable_module_multiset" = x"yes"])
 AM_CONDITIONAL([ENABLE_MODULE_RECOVERY], [test x"$enable_module_recovery" = x"yes"])
 AM_CONDITIONAL([ENABLE_MODULE_SCHNORR], [test x"$enable_module_schnorr" = x"yes"])
-AM_CONDITIONAL([USE_JNI], [test x"$use_jni" == x"yes"])
+AM_CONDITIONAL([USE_JNI], [test x"$use_jni" = x"yes"])
 AM_CONDITIONAL([USE_EXTERNAL_ASM], [test x"$use_external_asm" = x"yes"])
 AM_CONDITIONAL([USE_ASM_ARM], [test x"$set_asm" = x"arm"])