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-rw-r--r--Source/WarpX_py.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/WarpX_py.cpp b/Source/WarpX_py.cpp
index 8da36142b..8f7b36e45 100644
--- a/Source/WarpX_py.cpp
+++ b/Source/WarpX_py.cpp
@@ -1,6 +1,6 @@
#include <WarpX_py.H>
extern "C" {
- WARPX_CALLBACK_PY_FUNC_1 warpx_py_print_step;
+ WARPX_CALLBACK_PY_FUNC_1 warpx_py_print_step = nullptr;
}