diff --git a/.github/workflows/linux-full-tests.yml b/.github/workflows/linux-full-tests.yml
index 0d047c40ec..d2b26d5ec6 100644
--- a/.github/workflows/linux-full-tests.yml
+++ b/.github/workflows/linux-full-tests.yml
@@ -105,13 +105,11 @@ jobs:
             tag: noble
             cc: clang
             cxx: clang++
-            cxxflags: -Wno-deprecated-declarations
           - name: "Clang 19"
             shortname: clang19
             tag: oracular
             cc: clang
             cxx: clang++
-            cxxflags: -Wno-deprecated-declarations
           - name: "C++17 mode"
             shortname: c++17
             tag: rolling
diff --git a/.github/workflows/linux-nondefault.yml b/.github/workflows/linux-nondefault.yml
index a704336dc2..501fa8a8d8 100644
--- a/.github/workflows/linux-nondefault.yml
+++ b/.github/workflows/linux-nondefault.yml
@@ -100,13 +100,11 @@ jobs:
             tag: noble
             cc: clang
             cxx: clang++
-            cxxflags: -Wno-deprecated-declarations
           - name: "Clang 19"
             shortname: clang19
             tag: oracular
             cc: clang
             cxx: clang++
-            cxxflags: -Wno-deprecated-declarations
           - name: "C++17 mode"
             shortname: c++17
             tag: rolling
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 257475f1f3..3b26272195 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -44,14 +44,12 @@ jobs:
             tag: noble
             cc: clang
             cxx: clang++
-            cxxflags: -Wno-deprecated-declarations
             tests: true
           - name: "Clang 19"
             shortname: clang19
             tag: oracular
             cc: clang
             cxx: clang++
-            cxxflags: -Wno-deprecated-declarations
             tests: true
           - name: "C++17 mode"
             shortname: c++17
diff --git a/ql/currency.cpp b/ql/currency.cpp
index 5c268c9c22..fce0b13680 100644
--- a/ql/currency.cpp
+++ b/ql/currency.cpp
@@ -89,16 +89,10 @@ namespace QuantLib {
                        const std::string& formatString,
                        const Currency& triangulationCurrency,
                        const std::set<std::string>& minorUnitCodes)
-    : data_(ext::make_shared<Currency::Data>(name,
-                                             code,
-                                             numericCode,
-                                             symbol,
-                                             fractionSymbol,
-                                             fractionsPerUnit,
-                                             rounding,
-                                             formatString,
-                                             triangulationCurrency,
-                                             minorUnitCodes)) {}
+    : Currency(name, code, numericCode, symbol, fractionSymbol, fractionsPerUnit,
+               rounding, triangulationCurrency, minorUnitCodes) {
+        data_->formatString = formatString;
+    }
 
     QL_DEPRECATED_ENABLE_WARNING
 
diff --git a/ql/currency.hpp b/ql/currency.hpp
index 8bb2f9b004..a2588d0e40 100644
--- a/ql/currency.hpp
+++ b/ql/currency.hpp
@@ -139,7 +139,7 @@ namespace QuantLib {
         /*! \deprecated Use the constructor without formatString.
                         Deprecated in version 1.33.
         */
-        QL_DEPRECATED
+        [[deprecated("Use the constructor without formatString")]]
         Data(std::string name,
              std::string code,
              Integer numericCode,