diff --git a/src/ace.f90 b/src/ace.f90
index 4bbaab0b1..8f42f9045 100644
--- a/src/ace.f90
+++ b/src/ace.f90
@@ -690,6 +690,7 @@ contains
        IDAT = XSS(LDIS + LOCC + 1)
        NR   = XSS(LDIS + LOCC + 2)
        rxn % edist % law = LAW
+       rxn % edist % n_interp = NR
 
        ! allocate space for ENDF interpolation parameters
        if (NR > 0) then