diff --git a/src/regolith/regolith_mix.f90 b/src/regolith/regolith_mix.f90
index ab132ae8..8931d916 100644
--- a/src/regolith/regolith_mix.f90
+++ b/src/regolith/regolith_mix.f90
@@ -47,7 +47,7 @@ subroutine regolith_mix(user,surfi,mixing_depth,domain)
    newlayer%comp      = 0.0_DP
    newlayer%age(:)    = 0.0_SP
    allocate(newlayer%distvol(1+domain%rcnum))
-   newlayer%distvol(:) = 0.0_DP
+   newlayer%distvol(:) = 0.0_SP
    newlayer%ejm       = 0.0_DP
    newlayer%meltvolume = 0.0_DP
    newlayer%totvolume = 0.0_DP