diff --git a/releases/specs/hppa/netboot-hppa32.spec b/releases/specs/hppa/netboot-hppa32.spec
index e2e15639..378d23c6 100644
--- a/releases/specs/hppa/netboot-hppa32.spec
+++ b/releases/specs/hppa/netboot-hppa32.spec
@@ -18,6 +18,7 @@ boot/kernel/netboot32/gk_kernargs:   --all-ramdisk-modules
 
 netboot/use:
  -*
+ libtommath # dropbear requires libtomcrypt[libtommath]
  multicall
  shadow
  readline
diff --git a/releases/specs/hppa/netboot-hppa64.spec b/releases/specs/hppa/netboot-hppa64.spec
index b0241dc6..009b792a 100644
--- a/releases/specs/hppa/netboot-hppa64.spec
+++ b/releases/specs/hppa/netboot-hppa64.spec
@@ -17,6 +17,7 @@ boot/kernel/netboot64/gk_kernargs:   --cross-compile=hppa64-unknown-linux-gnu --
 
 netboot/use:
  -*
+ libtommath # dropbear requires libtomcrypt[libtommath]
  multicall
  shadow
  readline