diff --git a/asminc/signal.inc b/asminc/signal.inc
index ebde07e42..597cad413 100644
--- a/asminc/signal.inc
+++ b/asminc/signal.inc
@@ -49,8 +49,8 @@ SIGCOUNT        = 6             ; Number of signals
 .global         sigtable
 
 ; Function declarations
-.global         __sig_ign
-.global         __sig_dfl
+.global         ___sig_ign
+.global         ___sig_dfl
 .global         _signal
 .global         _raise
 
diff --git a/include/signal.h b/include/signal.h
index 0d5f6ad09..d67cebf7c 100644
--- a/include/signal.h
+++ b/include/signal.h
@@ -45,12 +45,12 @@ typedef unsigned char sig_atomic_t;
 typedef void __fastcall__ (*__sigfunc) (int);
 
 /* Functions that implement SIG_IGN and SIG_DFL */
-void __fastcall__ _sig_ign (int);
-void __fastcall__ _sig_dfl (int);
+void __fastcall__ __sig_ign (int);
+void __fastcall__ __sig_dfl (int);
 
 /* Standard signal handling functions */
-#define SIG_DFL         _sig_dfl
-#define SIG_IGN         _sig_ign
+#define SIG_DFL         __sig_dfl
+#define SIG_IGN         __sig_ign
 #define SIG_ERR         ((__sigfunc) 0x0000)
 
 /* Signal numbers */
diff --git a/libsrc/common/raise.s b/libsrc/common/raise.s
index 07898ef90..205bbd471 100644
--- a/libsrc/common/raise.s
+++ b/libsrc/common/raise.s
@@ -33,9 +33,9 @@ _raise:
 ; introduce race conditions, but it's the simplest way to satisfy the
 ; standard).
 
-        lda     #<__sig_dfl
+        lda     #<___sig_dfl
         sta     sigtable,x
-        lda     #>__sig_dfl
+        lda     #>___sig_dfl
         sta     sigtable+1,x
 
 ; Restore the signal number and call the function
diff --git a/libsrc/common/signal.s b/libsrc/common/signal.s
index 333072801..40262c457 100644
--- a/libsrc/common/signal.s
+++ b/libsrc/common/signal.s
@@ -54,7 +54,7 @@ _signal:
         pla
         tax
         pla
-__sig_ign:
+___sig_ign:
         rts
 
 ; Error entry: We use our knowledge that SIG_ERR is zero here to save a byte
@@ -63,6 +63,6 @@ invalidsig:
         lda     #<EINVAL
         jsr     __seterrno      ; Returns 0 in A
         tax                     ; A/X = 0
-__sig_dfl:
+___sig_dfl:
         rts
 
diff --git a/libsrc/common/sigtable.s b/libsrc/common/sigtable.s
index 7780ef634..873d1def3 100644
--- a/libsrc/common/sigtable.s
+++ b/libsrc/common/sigtable.s
@@ -14,11 +14,11 @@
 .data
 
 sigtable:
-        .word   __sig_dfl       ; SIGABRT
-        .word   __sig_dfl       ; SIGFPE
-        .word   __sig_dfl       ; SIGILL
-        .word   __sig_dfl       ; SIGINT
-        .word   __sig_dfl       ; SIGSEGV
-        .word   __sig_dfl       ; SIGTERM
+        .word   ___sig_dfl       ; SIGABRT
+        .word   ___sig_dfl       ; SIGFPE
+        .word   ___sig_dfl       ; SIGILL
+        .word   ___sig_dfl       ; SIGINT
+        .word   ___sig_dfl       ; SIGSEGV
+        .word   ___sig_dfl       ; SIGTERM