diff --git a/src/precord.h b/src/precord.h
index 4b475bc350..9104fb5f86 100644
--- a/src/precord.h
+++ b/src/precord.h
@@ -116,7 +116,7 @@ static inline void SET_LEN_PREC(Obj rec, UInt nr)
 static inline void SET_RNAM_PREC(Obj rec, UInt i, UInt rnam)
 {
     GAP_ASSERT(IS_PREC_OR_COMOBJ(rec));
-    GAP_ASSERT(i <= CAPACITY_PREC(rec));
+    GAP_ASSERT(i <= (UInt) CAPACITY_PREC(rec));
     *(UInt *)(ADDR_OBJ(rec)+2*(i)) = rnam;
 }
 
@@ -131,7 +131,7 @@ static inline void SET_RNAM_PREC(Obj rec, UInt i, UInt rnam)
 static inline UInt GET_RNAM_PREC(Obj rec, UInt i)
 {
     GAP_ASSERT(IS_PREC_OR_COMOBJ(rec));
-    GAP_ASSERT(i <= CAPACITY_PREC(rec));
+    GAP_ASSERT(i <= (UInt) CAPACITY_PREC(rec));
     return *(const UInt *)(CONST_ADDR_OBJ(rec)+2*(i));
 }
 
@@ -146,7 +146,7 @@ static inline UInt GET_RNAM_PREC(Obj rec, UInt i)
 static inline void SET_ELM_PREC(Obj rec, UInt i, Obj val)
 {
     GAP_ASSERT(IS_PREC_OR_COMOBJ(rec));
-    GAP_ASSERT(i <= CAPACITY_PREC(rec));
+    GAP_ASSERT(i <= (UInt) CAPACITY_PREC(rec));
     *(ADDR_OBJ(rec)+2*(i)+1) = val;
 }
 
@@ -161,7 +161,7 @@ static inline void SET_ELM_PREC(Obj rec, UInt i, Obj val)
 static inline Obj GET_ELM_PREC(Obj rec, UInt i)
 {
     GAP_ASSERT(IS_PREC_OR_COMOBJ(rec));
-    GAP_ASSERT(i <= CAPACITY_PREC(rec));
+    GAP_ASSERT(i <= (UInt) CAPACITY_PREC(rec));
     return *(CONST_ADDR_OBJ(rec)+2*(i)+1);
 }
 
diff --git a/src/stringobj.h b/src/stringobj.h
index 38682099a0..4802dba31b 100644
--- a/src/stringobj.h
+++ b/src/stringobj.h
@@ -206,7 +206,7 @@ static inline Obj GET_ELM_STRING(Obj list, Int pos)
 {
     GAP_ASSERT(IS_STRING_REP(list));
     GAP_ASSERT(pos > 0);
-    GAP_ASSERT(pos <= GET_LEN_STRING(list));
+    GAP_ASSERT((UInt) pos <= GET_LEN_STRING(list));
     UChar c = CHARS_STRING(list)[pos - 1];
     return ObjsChar[c];
 }
@@ -222,7 +222,7 @@ static inline void SET_ELM_STRING(Obj list, Int pos, Obj val)
 {
     GAP_ASSERT(IS_STRING_REP(list));
     GAP_ASSERT(pos > 0);
-    GAP_ASSERT(pos <= GET_LEN_STRING(list));
+    GAP_ASSERT((UInt) pos <= GET_LEN_STRING(list));
     GAP_ASSERT(TNUM_OBJ(val) == T_CHAR);
     UChar * ptr = CHARS_STRING(list) + (pos - 1);
     *ptr = CHAR_VALUE(val);