diff --git a/Common/Core/Testing/Cxx/TestFMT.cxx b/Common/Core/Testing/Cxx/TestFMT.cxx
index f57188e938..e44e369093 100644
--- a/Common/Core/Testing/Cxx/TestFMT.cxx
+++ b/Common/Core/Testing/Cxx/TestFMT.cxx
@@ -8,7 +8,7 @@
 #include <vector>
 
 // clang-format off
-#include VTK_FMT(fmt/core.h)
+#include VTK_FMT(fmt/format.h)
 #include VTK_FMT(fmt/ranges.h)
 // clang-format on
 
diff --git a/Filters/General/vtkGroupDataSetsFilter.cxx b/Filters/General/vtkGroupDataSetsFilter.cxx
index 261bcf0976..03aff2cf5a 100644
--- a/Filters/General/vtkGroupDataSetsFilter.cxx
+++ b/Filters/General/vtkGroupDataSetsFilter.cxx
@@ -22,7 +22,7 @@
 #include <vtk_fmt.h>
 
 // clang-format off
-#include VTK_FMT(fmt/core.h)
+#include VTK_FMT(fmt/format.h)
 // clang-format on
 
 VTK_ABI_NAMESPACE_BEGIN
diff --git a/IO/IOSS/vtkIOSSWriter.cxx b/IO/IOSS/vtkIOSSWriter.cxx
index 914dea5fd3..83760011ab 100644
--- a/IO/IOSS/vtkIOSSWriter.cxx
+++ b/IO/IOSS/vtkIOSSWriter.cxx
@@ -44,7 +44,7 @@
 
 // clang-format off
 #include <vtk_fmt.h> // needed for `fmt`
-#include VTK_FMT(fmt/core.h)
+#include VTK_FMT(fmt/format.h)
 // clang-format on
 
 VTK_ABI_NAMESPACE_BEGIN
diff --git a/Rendering/WebGPU/vtkWGPUContext.cxx b/Rendering/WebGPU/vtkWGPUContext.cxx
index b280022873..5244738f4d 100644
--- a/Rendering/WebGPU/vtkWGPUContext.cxx
+++ b/Rendering/WebGPU/vtkWGPUContext.cxx
@@ -4,7 +4,7 @@
 #include "vtkObject.h"
 #include "vtk_fmt.h"
 // clang-format off
-#include VTK_FMT(fmt/core.h)
+#include VTK_FMT(fmt/format.h)
 // clang-format on
 
 #include <memory>