diff --git a/xo-reader2/src/reader2/DExpectQArraySsm.cpp b/xo-reader2/src/reader2/DExpectQArraySsm.cpp
index b06920c4..d871347c 100644
--- a/xo-reader2/src/reader2/DExpectQArraySsm.cpp
+++ b/xo-reader2/src/reader2/DExpectQArraySsm.cpp
@@ -195,7 +195,7 @@ namespace xo {
 
                     bool ok = array_->push_back(p_psm->expr_alloc(), lit);
 
-                    assert(ok);
+                    if (!ok) assert(false);
                 }
 
                 // start syntax to receive next literal
diff --git a/xo-reader2/src/reader2/DExpectQDictSsm.cpp b/xo-reader2/src/reader2/DExpectQDictSsm.cpp
index 4a34d19a..2dd68ef3 100644
--- a/xo-reader2/src/reader2/DExpectQDictSsm.cpp
+++ b/xo-reader2/src/reader2/DExpectQDictSsm.cpp
@@ -243,7 +243,7 @@ namespace xo {
 
                 this->key_ = nullptr;
 
-                assert(ok);
+                if (!ok) assert(false);
 
                 return;
             }
diff --git a/xo-reader2/src/reader2/DLambdaSsm.cpp b/xo-reader2/src/reader2/DLambdaSsm.cpp
index e39e530b..cb184670 100644
--- a/xo-reader2/src/reader2/DLambdaSsm.cpp
+++ b/xo-reader2/src/reader2/DLambdaSsm.cpp
@@ -311,7 +311,7 @@ namespace xo {
                                                    param_var.data()->name(),
                                                    param_var.data()->typeref());
 
-                    assert(b.is_local());
+                    if (!b.is_local()) assert(false);
 
                     this->local_symtab_ = symtab;
                 }