diff --git a/plugins/org.jkiss.dbeaver.ext.postgresql/src/org/jkiss/dbeaver/ext/postgresql/model/PostgreProcedure.java b/plugins/org.jkiss.dbeaver.ext.postgresql/src/org/jkiss/dbeaver/ext/postgresql/model/PostgreProcedure.java
index b425705ce0b52020d71633bc96a5dc3f1a591672..5a8ab984ab9df485fb0b54f150b75d1f8c7e3626 100644
--- a/plugins/org.jkiss.dbeaver.ext.postgresql/src/org/jkiss/dbeaver/ext/postgresql/model/PostgreProcedure.java
+++ b/plugins/org.jkiss.dbeaver.ext.postgresql/src/org/jkiss/dbeaver/ext/postgresql/model/PostgreProcedure.java
@@ -357,7 +357,9 @@ public class PostgreProcedure extends AbstractProcedure<PostgreDataSource, Postg
             paramsSignature.append("(");
             boolean hasParam = false;
             for (PostgreProcedureParameter param : params) {
-                if (param.getParameterKind() == DBSProcedureParameterKind.OUT) {
+                if (param.getParameterKind() != DBSProcedureParameterKind.IN &&
+                    param.getParameterKind() != DBSProcedureParameterKind.INOUT)
+                {
                     continue;
                 }
                 if (hasParam) paramsSignature.append(',');