diff --git a/ecp5/arch.cc b/ecp5/arch.cc
index 7f7079bf..2b40e79a 100644
--- a/ecp5/arch.cc
+++ b/ecp5/arch.cc
@@ -141,9 +141,8 @@ Arch::Arch(ArchArgs args) : args(args)
 
 // -----------------------------------------------------------------------
 
-std::string Arch::getChipName()
+std::string Arch::getChipName() const
 {
-
     if (args.type == ArchArgs::LFE5U_25F) {
         return "LFE5U-25F";
     } else if (args.type == ArchArgs::LFE5U_45F) {
diff --git a/ecp5/arch.h b/ecp5/arch.h
index 7d183e11..2421428f 100644
--- a/ecp5/arch.h
+++ b/ecp5/arch.h
@@ -399,7 +399,7 @@ struct Arch : BaseCtx
     ArchArgs args;
     Arch(ArchArgs args);
 
-    std::string getChipName();
+    std::string getChipName() const;
 
     IdString archId() const { return id("ecp5"); }
     IdString archArgsToId(ArchArgs args) const;
diff --git a/generic/arch.h b/generic/arch.h
index ed069d4d..9a0da75b 100644
--- a/generic/arch.h
+++ b/generic/arch.h
@@ -122,7 +122,7 @@ struct Arch : BaseCtx
 
     Arch(ArchArgs args);
 
-    std::string getChipName() { return chipName; }
+    std::string getChipName() const { return chipName; }
 
     IdString archId() const { return id("generic"); }
     IdString archArgsToId(ArchArgs args) const { return id("none"); }
diff --git a/ice40/arch.cc b/ice40/arch.cc
index fd68e972..f3004155 100644
--- a/ice40/arch.cc
+++ b/ice40/arch.cc
@@ -204,7 +204,7 @@ Arch::Arch(ArchArgs args) : args(args)
 
 // -----------------------------------------------------------------------
 
-std::string Arch::getChipName()
+std::string Arch::getChipName() const
 {
 #ifdef ICE40_HX1K_ONLY
     if (args.type == ArchArgs::HX1K) {
diff --git a/ice40/arch.h b/ice40/arch.h
index 1d68ec4a..7efa733c 100644
--- a/ice40/arch.h
+++ b/ice40/arch.h
@@ -365,7 +365,7 @@ struct Arch : BaseCtx
     ArchArgs args;
     Arch(ArchArgs args);
 
-    std::string getChipName();
+    std::string getChipName() const;
 
     IdString archId() const { return id("ice40"); }
     IdString archArgsToId(ArchArgs args) const;