diff --git a/Lib/fontTools/feaLib/ast.py b/Lib/fontTools/feaLib/ast.py
index ef068b82b..e52d768ec 100644
--- a/Lib/fontTools/feaLib/ast.py
+++ b/Lib/fontTools/feaLib/ast.py
@@ -2065,7 +2065,7 @@ class ConditionsetStatement(Statement):
         self.conditions = conditions
 
     def build(self, builder):
-        builder.add_conditionset(self.name, self.conditions)
+        builder.add_conditionset(self.location, self.name, self.conditions)
 
     def asFea(self, res="", indent=""):
         res += indent + f"conditionset {self.name} " + "{\n"
diff --git a/Lib/fontTools/feaLib/builder.py b/Lib/fontTools/feaLib/builder.py
index 997a733de..7bc38fa0b 100644
--- a/Lib/fontTools/feaLib/builder.py
+++ b/Lib/fontTools/feaLib/builder.py
@@ -1568,10 +1568,11 @@ class Builder(object):
     def add_vhea_field(self, key, value):
         self.vhea_[key] = value
 
-    def add_conditionset(self, key, value):
-        if not "fvar" in self.font:
+    def add_conditionset(self, location, key, value):
+        if "fvar" not in self.font:
             raise FeatureLibError(
-                "Cannot add feature variations to a font without an 'fvar' table"
+                "Cannot add feature variations to a font without an 'fvar' table",
+                location,
             )
 
         # Normalize