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-rw-r--r--Source/Diagnostics/ReducedDiags/ParticleHistogram2D.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/Source/Diagnostics/ReducedDiags/ParticleHistogram2D.cpp b/Source/Diagnostics/ReducedDiags/ParticleHistogram2D.cpp
index a3c65f693..0567f1cfc 100644
--- a/Source/Diagnostics/ReducedDiags/ParticleHistogram2D.cpp
+++ b/Source/Diagnostics/ReducedDiags/ParticleHistogram2D.cpp
@@ -299,6 +299,7 @@ void ParticleHistogram2D::WriteToFile (int step) const
series.flush();
#else
+ amrex::ignore_unused(step);
WARPX_ABORT_WITH_MESSAGE("ParticleHistogram2D: Needs openPMD-api compiled into WarpX, but was not found!");
#endif
}