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-rw-r--r--libcrystfel/src/indexers/asdf.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/libcrystfel/src/indexers/asdf.c b/libcrystfel/src/indexers/asdf.c
index 4473b3f2..b1c1246a 100644
--- a/libcrystfel/src/indexers/asdf.c
+++ b/libcrystfel/src/indexers/asdf.c
@@ -397,6 +397,8 @@ static float find_ds_fft(double *projections, int N_projections, double d_max,
int i_max = (int)(d_max * (projections_sorted[n - 1] -
projections_sorted[0]));
+ if ( i_max > N / 2 ) i_max = N / 2;
+
int d = 1;
double maxval = 0;
for ( i=1; i<=i_max; i++ ) {