diff --git a/arch/um/sys-i386/asm/elf.h b/arch/um/sys-i386/asm/elf.h
index e64cd41d7babad9d9eaee2afb010e590d242aaf6..a979a22a8d9f0567aca79521318f711025b5d1c8 100644
--- a/arch/um/sys-i386/asm/elf.h
+++ b/arch/um/sys-i386/asm/elf.h
@@ -75,6 +75,8 @@ typedef struct user_i387_struct elf_fpregset_t;
 	pr_reg[16] = PT_REGS_SS(regs);		\
 } while (0);
 
+struct task_struct;
+
 extern int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu);
 
 #define ELF_CORE_COPY_FPREGS(t, fpu) elf_core_copy_fpregs(t, fpu)
diff --git a/arch/um/sys-x86_64/asm/elf.h b/arch/um/sys-x86_64/asm/elf.h
index 49655c83efd2241b4d80b044b283207a3a3493ec..d760967f33a7e029afd8792ded750e31911488fb 100644
--- a/arch/um/sys-x86_64/asm/elf.h
+++ b/arch/um/sys-x86_64/asm/elf.h
@@ -95,6 +95,8 @@ typedef struct user_i387_struct elf_fpregset_t;
 	(pr_reg)[25] = 0;					\
 	(pr_reg)[26] = 0;
 
+struct task_struct;
+
 extern int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu);
 
 #define ELF_CORE_COPY_FPREGS(t, fpu) elf_core_copy_fpregs(t, fpu)