diff --git a/kiss/src/kiss/Helpers.hx b/kiss/src/kiss/Helpers.hx
index ed640e36..f44a53dc 100644
--- a/kiss/src/kiss/Helpers.hx
+++ b/kiss/src/kiss/Helpers.hx
@@ -406,6 +406,10 @@ class Helpers {
         for (name => value in k.macroVars) {
             interp.variables.set(name, value);
         }
+        interp.variables.set("_setMacroVar", (name, value) -> {
+            k.macroVars[name] = value;
+            interp.variables.set(name, value);
+        });
 
         function innerRunAtCompileTimeDynamic(innerExp:ReaderExp) {
             // in case macroVars have changed
diff --git a/kiss/src/kiss/Kiss.hx b/kiss/src/kiss/Kiss.hx
index b8a3ebcd..0539ea7f 100644
--- a/kiss/src/kiss/Kiss.hx
+++ b/kiss/src/kiss/Kiss.hx
@@ -407,7 +407,7 @@ class Kiss {
                 case Symbol(varName) if (k.macroVars.exists(varName)):
                     var b = wholeExp.expBuilder();
                     // have this throw during macroEXPANSION, not before (so assertThrows will catch it)
-                    copy.convert(b.throwCompileError('If you intend to change macroVar $varName, use defMacroVar instead. If not, rename your local variable for clarity.'));
+                    copy.convert(b.throwCompileError('If you intend to change macroVar $varName, use setMacroVar instead. If not, rename your local variable for clarity.'));
                 default:
                     setLocal(wholeExp, exps, copy);
             };
diff --git a/kiss/src/kiss/Macros.hx b/kiss/src/kiss/Macros.hx
index e9d58664..58c41223 100644
--- a/kiss/src/kiss/Macros.hx
+++ b/kiss/src/kiss/Macros.hx
@@ -798,6 +798,15 @@ class Macros {
             return null;
         };
 
+        macros["setMacroVar"] = (wholeExp:ReaderExp, exps:Array<ReaderExp>, k:KissState) -> {
+            wholeExp.checkNumArgs(2, 2, "(setMacroVar <name> <value>)");
+
+            var name = exps[0].symbolName().withPosOf(exps[0]);
+            var b = wholeExp.expBuilder();
+            
+            return b.callSymbol("_setMacroVar", [name, exps[1]]);
+        };
+
         macros["defMacroFunction"] = (wholeExp:ReaderExp, exps:Array<ReaderExp>, k:KissState) -> {
             wholeExp.checkNumArgs(3, null, "(defMacroFunction <name> [<args>] <body...>)");
             var b = wholeExp.expBuilder();
diff --git a/kiss/src/test/cases/MacroTestCase.kiss b/kiss/src/test/cases/MacroTestCase.kiss
index b30e7aad..7d464cb8 100644
--- a/kiss/src/test/cases/MacroTestCase.kiss
+++ b/kiss/src/test/cases/MacroTestCase.kiss
@@ -60,7 +60,7 @@
     (_testPrintAtMacroTimeMacro)
     (Assert.pass))
 
-// Calling (set) on a macroVar is a faux-pas, but calling defMacroVar again is not
+// Calling (set) on a macroVar is a faux-pas, because (setMacroVar) is the right way
 (defMacroVar count 0)
 (defMacro _testSetMacroVarMacro []
     (assertThrows (set count (+ count 1)))
@@ -71,7 +71,7 @@
     (Assert.pass))
 
 (defMacro _testRedefineMacroVarMacro []
-    (defMacroVar count (+ count 1))
+    (setMacroVar count (+ count 1))
     (symbol (Std.string count)))
 
 (function _testRedefineMacroVar []