diff --git a/package/libkrb5/libkrb5.mk b/package/libkrb5/libkrb5.mk
index 62a34b2379..c58763eddd 100644
--- a/package/libkrb5/libkrb5.mk
+++ b/package/libkrb5/libkrb5.mk
@@ -33,6 +33,13 @@ LIBKRB5_CONF_OPTS = \
 	--without-tcl \
 	--disable-rpath
 
+# libkrb5 has some assembly function that is not present in Thumb mode:
+# Error: selected processor does not support `mcr p15,0,r2,c7,c10,5' in Thumb mode
+# so, we desactivate Thumb mode
+ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)
+LIBKRB5_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -marm"
+endif
+
 # Enabling static and shared at the same time is not supported
 ifeq ($(BR2_SHARED_STATIC_LIBS),y)
 LIBKRB5_CONF_OPTS += --disable-static