diff --git a/codeGenCpu6502/src/prog8/codegen/cpu6502/AsmGen.kt b/codeGenCpu6502/src/prog8/codegen/cpu6502/AsmGen.kt
index 222cfdee9..d2e542e95 100644
--- a/codeGenCpu6502/src/prog8/codegen/cpu6502/AsmGen.kt
+++ b/codeGenCpu6502/src/prog8/codegen/cpu6502/AsmGen.kt
@@ -37,7 +37,8 @@ class AsmGen6502(val prefixSymbols: Boolean): ICodeGeneratorBackend {
                 is PtAsmSub, is PtSub -> node.name = "p8s_${node.name}"
                 is PtBlock -> node.name = "p8b_${node.name}"
                 is PtLabel -> node.name = "p8l_${node.name}"
-                is PtVariable, is PtConstant, is PtMemMapped, is PtSubroutineParameter -> node.name = "p8v_${node.name}"
+                is PtConstant -> node.name = "p8c_${node.name}"
+                is PtVariable, is PtMemMapped, is PtSubroutineParameter -> node.name = "p8v_${node.name}"
                 else -> node.name = "p8_${node.name}"
             }
         }
diff --git a/compilerAst/src/prog8/compiler/CallGraph.kt b/compilerAst/src/prog8/compiler/CallGraph.kt
index 34ac9f49c..7628ba97a 100644
--- a/compilerAst/src/prog8/compiler/CallGraph.kt
+++ b/compilerAst/src/prog8/compiler/CallGraph.kt
@@ -167,7 +167,7 @@ class CallGraph(private val program: Program) : IAstVisitor {
         return allIdentifiersAndTargets.filter { decl===it.value }.map{ it.key } + assemblyBlocks
     }
 
-    private val prefixes = listOf("p8b_", "p8v_", "p8s_", "p8l_", "p8_", "")
+    private val prefixes = listOf("p8b_", "p8v_", "p8s_", "p8c_", "p8l_", "p8_", "")
     private fun nameInAssemblyCode(name: String, knownAsmPrefixes: List<String> = emptyList()): Boolean {
         if(knownAsmPrefixes.isNotEmpty())
             return allAssemblyNodes.any {
diff --git a/docs/source/technical.rst b/docs/source/technical.rst
index 2c35b0787..739d275b4 100644
--- a/docs/source/technical.rst
+++ b/docs/source/technical.rst
@@ -38,6 +38,7 @@ Element type prefix
 Block        ``p8b_``
 Subroutine   ``p8s_``
 Variable     ``p8v_``
+Constant     ``p8c_``
 Label        ``p8l_``
 other        ``p8_``
 ============ ========
diff --git a/docs/source/todo.rst b/docs/source/todo.rst
index aadfb571f..9a831f16e 100644
--- a/docs/source/todo.rst
+++ b/docs/source/todo.rst
@@ -2,7 +2,7 @@
 TODO
 ====
 
-- make constants have p8c_ prefix instead of p8v_
+- add unit tests for chained comparisons and for var -> const optimization
 - add INFO error level and move some warnings to info
 - add switch to enable INFO error messages (default is WARN and up)