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-rw-r--r--py/mpconfig.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/py/mpconfig.h b/py/mpconfig.h
index 922f865e2f..ef078d3b72 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -98,7 +98,9 @@
// Number of bytes in memory allocation/GC block. Any size allocated will be
// rounded up to be multiples of this.
+#ifndef MICROPY_BYTES_PER_GC_BLOCK
#define MICROPY_BYTES_PER_GC_BLOCK (4 * BYTES_PER_WORD)
+#endif
// Number of words allocated (in BSS) to the GC stack (minimum is 1)
#ifndef MICROPY_ALLOC_GC_STACK_SIZE