diff --git a/dynasm/dasm_arm.h b/dynasm/dasm_arm.h
index 691cfdd7..d83cbbb3 100644
--- a/dynasm/dasm_arm.h
+++ b/dynasm/dasm_arm.h
@@ -211,7 +211,8 @@ void dasm_put(Dst_DECL, int start, ...)
       case DASM_ALIGN: ofs += (ins & 255); b[pos++] = ofs; break;
       case DASM_REL_LG:
 	n = (ins & 2047) - 10; pl = D->lglabels + n;
-	if (n >= 0) { CKPL(lg, LG); goto putrel; }  /* Bkwd rel or global. */
+	/* Bkwd rel or global. */
+	if (n >= 0) { CK(n>=10||*pl<0, RANGE_LG); CKPL(lg, LG); goto putrel; }
 	pl += 10; n = *pl;
 	if (n < 0) n = 0;  /* Start new chain for fwd rel if label exists. */
 	goto linkrel;
diff --git a/dynasm/dasm_mips.h b/dynasm/dasm_mips.h
index 77a8eb52..0866beb8 100644
--- a/dynasm/dasm_mips.h
+++ b/dynasm/dasm_mips.h
@@ -202,7 +202,8 @@ void dasm_put(Dst_DECL, int start, ...)
       case DASM_ALIGN: ofs += (ins & 255); b[pos++] = ofs; break;
       case DASM_REL_LG:
 	n = (ins & 2047) - 10; pl = D->lglabels + n;
-	if (n >= 0) { CKPL(lg, LG); goto putrel; }  /* Bkwd rel or global. */
+	/* Bkwd rel or global. */
+	if (n >= 0) { CK(n>=10||*pl<0, RANGE_LG); CKPL(lg, LG); goto putrel; }
 	pl += 10; n = *pl;
 	if (n < 0) n = 0;  /* Start new chain for fwd rel if label exists. */
 	goto linkrel;
diff --git a/dynasm/dasm_ppc.h b/dynasm/dasm_ppc.h
index 774ee6ed..13c44611 100644
--- a/dynasm/dasm_ppc.h
+++ b/dynasm/dasm_ppc.h
@@ -202,7 +202,8 @@ void dasm_put(Dst_DECL, int start, ...)
       case DASM_ALIGN: ofs += (ins & 255); b[pos++] = ofs; break;
       case DASM_REL_LG:
 	n = (ins & 2047) - 10; pl = D->lglabels + n;
-	if (n >= 0) { CKPL(lg, LG); goto putrel; }  /* Bkwd rel or global. */
+	/* Bkwd rel or global. */
+	if (n >= 0) { CK(n>=10||*pl<0, RANGE_LG); CKPL(lg, LG); goto putrel; }
 	pl += 10; n = *pl;
 	if (n < 0) n = 0;  /* Start new chain for fwd rel if label exists. */
 	goto linkrel;
diff --git a/dynasm/dasm_x86.h b/dynasm/dasm_x86.h
index eb2bc768..c91bfdd5 100644
--- a/dynasm/dasm_x86.h
+++ b/dynasm/dasm_x86.h
@@ -213,7 +213,8 @@ void dasm_put(Dst_DECL, int start, ...)
       case DASM_REL_LG:
       case DASM_IMM_LG:
 	n = *p++; pl = D->lglabels + n;
-	if (n <= 246) { CKPL(lg, LG); goto putrel; }  /* Bkwd rel or global. */
+	/* Bkwd rel or global. */
+	if (n <= 246) { CK(n>=10||*pl<0, RANGE_LG); CKPL(lg, LG); goto putrel; }
 	pl -= 246; n = *pl;
 	if (n < 0) n = 0;  /* Start new chain for fwd rel if label exists. */
 	goto linkrel;