1 files changed, 1 insertions, 1 deletions
diff --git a/src/param.cpp b/src/param.cpp
index 28d6bc3e..a716f9b9 100644
--- a/src/param.cpp
+++ b/src/param.cpp
@@ -220,7 +220,7 @@ PROJVALUE pj_param (PJ_CONTEXT *ctx, paralist *pl, const char *opt) {
             value.i = 1;
             break;
         default:
-            proj_context_errno_set (ctx, PJD_ERR_INVALID_BOOLEAN_PARAM);
+            proj_context_errno_set (ctx, PROJ_ERR_INVALID_OP_ILLEGAL_ARG_VALUE);
             value.i = 0;
             break;
         }