diff --git a/bindings/posix/src/test/scala/org/scalanative/bindgen/bindings/tests/RegexSpec.scala b/bindings/posix/src/test/scala/org/scalanative/bindgen/bindings/tests/RegexSpec.scala
index 4be4a56..24d4537 100644
--- a/bindings/posix/src/test/scala/org/scalanative/bindgen/bindings/tests/RegexSpec.scala
+++ b/bindings/posix/src/test/scala/org/scalanative/bindgen/bindings/tests/RegexSpec.scala
@@ -12,7 +12,7 @@ class RegexSpec extends FunSpec {
       val reg = stackalloc[regex_t]
 
       val compResult =
-        regcomp(reg, c"Scala \\(\\(J\\(VM\\|S\\)\\)\\|Native\\)", 0)
+        regcomp(reg, c"Scala \(J\(S\|VM\)\|Native\)", defines.REG_EXTENDED)
       assert(compResult == 0)
 
       assert(regexec(reg, c"Scala JVM", 0, null, 0) == 0)