2 files changed, 6 insertions, 2 deletions
diff --git a/src/iso19111/c_api.cpp b/src/iso19111/c_api.cpp
index f7dcd354..f6138e9b 100644
--- a/src/iso19111/c_api.cpp
+++ b/src/iso19111/c_api.cpp
@@ -134,8 +134,7 @@ static PJ *pj_obj_create(PJ_CONTEXT *ctx, const IdentifiedObjectNNPtr &objIn) {
             auto formatter = PROJStringFormatter::create(
                 PROJStringFormatter::Convention::PROJ_5, dbContext);
             auto projString = coordop->exportToPROJString(formatter.get());
-            auto pj = pj_create_internal(
-                ctx, projString.empty() ? "+proj=affine" : projString.c_str());
+            auto pj = pj_create_internal(ctx, projString.c_str());
             if (pj) {
                 pj->iso_obj = objIn;
                 return pj;
diff --git a/src/iso19111/io.cpp b/src/iso19111/io.cpp
index 578234b4..a933dcad 100644
--- a/src/iso19111/io.cpp
+++ b/src/iso19111/io.cpp
@@ -5342,6 +5342,11 @@ const std::string &PROJStringFormatter::toString() const {
             }
         }
     }
+
+    if (d->result_.empty()) {
+        d->appendToResult("+proj=noop");
+    }
+
     return d->result_;
 }