diff --git a/vtk.spec b/vtk.spec
index 4e404f4..deb473b 100644
--- a/vtk.spec
+++ b/vtk.spec
@@ -236,6 +236,7 @@ Requires:       %{shlib} = %{version}
 Requires:       cgns-devel
 Requires:       cmake >= 3.4
 Requires:       double-conversion-devel
+%{?with_fmt:Requires:       fmt-devel}
 Requires:       gcc-c++
 %{?with_gl2ps:Requires:       gl2ps-devel}
 Requires:       hdf5-devel
@@ -249,6 +250,7 @@ Requires:       python3-%{name} = %{version}
 Requires:       utfcpp-devel
 %{?with_mpi:Requires:       %{mpi_flavor}}
 %{?with_mpi:Requires:       %{mpi_flavor}-devel}
+%{?with_fast_float:Requires:       cmake(FastFloat)}
 Requires:       cmake(Verdict)
 Requires:       cmake(nlohmann_json)
 Requires:       pkgconfig(Qt5Core)