diff --git a/third_party/nlbuild-autotools/repo/tools/host/i686-pc-cygwin/bin/automake b/third_party/nlbuild-autotools/repo/tools/host/i686-pc-cygwin/bin/automake
index 9c74dd31d..c7f9cea7f 100755
--- a/third_party/nlbuild-autotools/repo/tools/host/i686-pc-cygwin/bin/automake
+++ b/third_party/nlbuild-autotools/repo/tools/host/i686-pc-cygwin/bin/automake
@@ -3927,7 +3927,7 @@ sub substitute_ac_subst_variables_worker
 sub substitute_ac_subst_variables
 {
   my ($text) = @_;
-  $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+  $text =~ s/\$\{([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
   return $text;
 }
 
diff --git a/third_party/nlbuild-autotools/repo/tools/host/i686-pc-linux-gnu/bin/automake b/third_party/nlbuild-autotools/repo/tools/host/i686-pc-linux-gnu/bin/automake
index 9c74dd31d..c7f9cea7f 100755
--- a/third_party/nlbuild-autotools/repo/tools/host/i686-pc-linux-gnu/bin/automake
+++ b/third_party/nlbuild-autotools/repo/tools/host/i686-pc-linux-gnu/bin/automake
@@ -3927,7 +3927,7 @@ sub substitute_ac_subst_variables_worker
 sub substitute_ac_subst_variables
 {
   my ($text) = @_;
-  $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+  $text =~ s/\$\{([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
   return $text;
 }
 
diff --git a/third_party/nlbuild-autotools/repo/tools/host/x86_64-apple-darwin/bin/automake b/third_party/nlbuild-autotools/repo/tools/host/x86_64-apple-darwin/bin/automake
index 9c74dd31d..c7f9cea7f 100755
--- a/third_party/nlbuild-autotools/repo/tools/host/x86_64-apple-darwin/bin/automake
+++ b/third_party/nlbuild-autotools/repo/tools/host/x86_64-apple-darwin/bin/automake
@@ -3927,7 +3927,7 @@ sub substitute_ac_subst_variables_worker
 sub substitute_ac_subst_variables
 {
   my ($text) = @_;
-  $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+  $text =~ s/\$\{([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
   return $text;
 }
 
diff --git a/third_party/nlbuild-autotools/repo/tools/host/x86_64-unknown-linux-gnu/bin/automake b/third_party/nlbuild-autotools/repo/tools/host/x86_64-unknown-linux-gnu/bin/automake
index 9c74dd31d..c7f9cea7f 100755
--- a/third_party/nlbuild-autotools/repo/tools/host/x86_64-unknown-linux-gnu/bin/automake
+++ b/third_party/nlbuild-autotools/repo/tools/host/x86_64-unknown-linux-gnu/bin/automake
@@ -3927,7 +3927,7 @@ sub substitute_ac_subst_variables_worker
 sub substitute_ac_subst_variables
 {
   my ($text) = @_;
-  $text =~ s/\${([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
+  $text =~ s/\$\{([^ \t=:+{}]+)}/substitute_ac_subst_variables_worker ($1)/ge;
   return $text;
 }