diff --git a/include/cantera/oneD/StFlow.h b/include/cantera/oneD/StFlow.h
index 76e93bb0e..f2430d085 100644
--- a/include/cantera/oneD/StFlow.h
+++ b/include/cantera/oneD/StFlow.h
@@ -312,7 +312,7 @@ public:
      * @f$ V(z) = 0 @f$ by definition.
      * @since New in %Cantera 3.0
      */
-    bool usesLambda() const {
+    bool isStrained() const {
         return m_usesLambda;
     }
 
diff --git a/src/oneD/Boundary1D.cpp b/src/oneD/Boundary1D.cpp
index 942a98320..919ae93c1 100644
--- a/src/oneD/Boundary1D.cpp
+++ b/src/oneD/Boundary1D.cpp
@@ -148,7 +148,7 @@ void Inlet1D::init()
     // Note that an inlet object can only be a terminal object - it cannot have
     // flows on both the left and right
     if (m_flow_left && !m_flow_right) {
-        if (!m_flow_left->usesLambda()) {
+        if (!m_flow_left->isStrained()) {
             throw CanteraError("Inlet1D::init",
                 "Right inlets with right-to-left flow are only supported for "
                 "strained flow configurations.");
@@ -201,7 +201,7 @@ void Inlet1D::eval(size_t jg, double* xg, double* rg,
             // Set mdot equal to rho*u, and also set lambda to zero.
             m_mdot = m_flow->density(0) * xb[c_offset_U];
             rb[c_offset_L] = xb[c_offset_L];
-        } else if (m_flow->usesLambda()) {
+        } else if (m_flow->isStrained()) {
             // The flow domain sets this to -rho*u. Add mdot to specify the mass
             // flow rate
             rb[c_offset_L] += m_mdot;