diff --git a/Library/Homebrew/cmd/update-reset.sh b/Library/Homebrew/cmd/update-reset.sh
index a7b597afa5..f87d623b25 100644
--- a/Library/Homebrew/cmd/update-reset.sh
+++ b/Library/Homebrew/cmd/update-reset.sh
@@ -12,6 +12,10 @@ git() {
     # HOMEBREW_LIBRARY is set by bin/brew
     # shellcheck disable=SC2154
     GIT_EXECUTABLE="$("${HOMEBREW_LIBRARY}/Homebrew/shims/shared/git" --homebrew=print-path)"
+    if [[ -z "${GIT_EXECUTABLE}" ]]
+    then
+      odie "Can't find a working Git!"
+    fi
   fi
   "${GIT_EXECUTABLE}" "$@"
 }
diff --git a/Library/Homebrew/cmd/update.sh b/Library/Homebrew/cmd/update.sh
index cf096c46f8..2bcee9996e 100644
--- a/Library/Homebrew/cmd/update.sh
+++ b/Library/Homebrew/cmd/update.sh
@@ -25,6 +25,10 @@ curl() {
   if [[ -z "${CURL_EXECUTABLE}" ]]
   then
     CURL_EXECUTABLE="$("${HOMEBREW_LIBRARY}/Homebrew/shims/shared/curl" --homebrew=print-path)"
+    if [[ -z "${CURL_EXECUTABLE}" ]]
+    then
+      odie "Can't find a working Curl!"
+    fi
   fi
   "${CURL_EXECUTABLE}" "$@"
 }
@@ -33,6 +37,10 @@ git() {
   if [[ -z "${GIT_EXECUTABLE}" ]]
   then
     GIT_EXECUTABLE="$("${HOMEBREW_LIBRARY}/Homebrew/shims/shared/git" --homebrew=print-path)"
+    if [[ -z "${GIT_EXECUTABLE}" ]]
+    then
+      odie "Can't find a working Git!"
+    fi
   fi
   "${GIT_EXECUTABLE}" "$@"
 }