diff --git a/NEWS.md b/NEWS.md
index c490cc2..54ab307 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -8,6 +8,7 @@
 
 * Drop old typos that snuck through the WORDLIST setup (#73)
 * Turn off credential caching in WORDLIST update action preventing CI from restarting (#74)
+* Prepend missing zero to the start of the GI PMF for the sample dataset
 
 ## Developer tooling
 
diff --git a/data-raw/sir_gt_pmf.R b/data-raw/sir_gt_pmf.R
index 3cdb98c..2cf5e65 100644
--- a/data-raw/sir_gt_pmf.R
+++ b/data-raw/sir_gt_pmf.R
@@ -11,7 +11,8 @@ sir_gt_pmf <- primarycensored::dpcens(0:26,
 ) # v0.4.0
 
 # Drop first element because GI can't have same-day transmission
-sir_gt_pmf <- sir_gt_pmf[2:27]
+# and replace with a zero
+sir_gt_pmf <- c(0, sir_gt_pmf[2:27])
 
 # Renormalize to a proper PMF
 while (abs(sum(sir_gt_pmf) - 1) > 1e-10) {
diff --git a/data/sir_gt_pmf.rda b/data/sir_gt_pmf.rda
index 1fa8bf2..271d526 100644
Binary files a/data/sir_gt_pmf.rda and b/data/sir_gt_pmf.rda differ