diff --git a/amiga/font_diskfont.c b/amiga/font_diskfont.c
index f48f0f465..e1a62447d 100644
--- a/amiga/font_diskfont.c
+++ b/amiga/font_diskfont.c
@@ -94,11 +94,11 @@ static void ami_font_bm_close(struct TextFont *bmfont)
 	CloseFont(bmfont);
 }
 
-static size_t ami_font_bm_convert_local_to_utf8_offset(const char *utf8string, int length, size_t offset)
+static size_t ami_font_bm_convert_local_to_utf8_offset(const char *utf8string, size_t length, UWORD offset)
 {
 	size_t chr = 0;
 
-	for(size_t i = 0; i < offset; i++) {
+	for(UWORD i = 0; i < offset; i++) {
 		chr = utf8_next(utf8string, length, chr);
 	}
 	
@@ -123,7 +123,7 @@ static bool amiga_bm_nsfont_width(const plot_font_style_t *fstyle,
 		return false;
 	}
 
-	*width = TextLength(glob->rp, localtext, strlen(localtext));
+	*width = (int)TextLength(glob->rp, localtext, (UWORD)strlen(localtext));
 	free(localtext);
 
 	ami_font_bm_close(bmfont);
@@ -150,7 +150,7 @@ static bool amiga_bm_nsfont_position_in_string(const plot_font_style_t *fstyle,
 	struct TextExtent extent;
 	struct TextFont *bmfont;
 	char *localtext = NULL;
-	size_t co = 0;
+	UWORD co = 0;
 
 	if((glob == NULL) || (glob->rp == NULL)) return false;
 
@@ -162,7 +162,7 @@ static bool amiga_bm_nsfont_position_in_string(const plot_font_style_t *fstyle,
 		return false;
 	}
 
-	co = TextFit(glob->rp, localtext, strlen(localtext),
+	co = TextFit(glob->rp, localtext, (UWORD)strlen(localtext),
 						&extent, NULL, 1, x, 32767);
 	*char_offset = ami_font_bm_convert_local_to_utf8_offset(string, length, co);
 	*actual_x = extent.te_Extent.MaxX;
@@ -202,7 +202,7 @@ static bool amiga_bm_nsfont_split(const plot_font_style_t *fstyle,
 		int x, size_t *char_offset, int *actual_x)
 {
 	struct TextExtent extent;
-	size_t co, offset;
+	UWORD co, offset;
 	char *charp;
 	char *localtext;
 
@@ -216,7 +216,7 @@ static bool amiga_bm_nsfont_split(const plot_font_style_t *fstyle,
 		return false;
 	}
 	
-	offset = TextFit(glob->rp, localtext, strlen(localtext),
+	offset = TextFit(glob->rp, localtext, (UWORD)strlen(localtext),
 				&extent, NULL, 1, x, 32767);
 
 	co = offset;
@@ -237,8 +237,8 @@ static bool amiga_bm_nsfont_split(const plot_font_style_t *fstyle,
 		}
 	}
 	
-	if((co > 0) && (co <= strlen(localtext))) {
-		*actual_x = TextLength(glob->rp, localtext, co);
+	if((co > 0) && (co < strlen(localtext))) {
+		*actual_x = (int)TextLength(glob->rp, localtext, co);
 		*char_offset = ami_font_bm_convert_local_to_utf8_offset(string, length, co);
 	} else {
 		*actual_x = x;
@@ -263,7 +263,7 @@ static ULONG amiga_bm_nsfont_text(struct RastPort *rp, const char *string, ULONG
 	if(bmfont == NULL) return 0;
 	if(utf8_to_local_encoding(string, length, &localtext) == NSERROR_OK) {
 		Move(rp, dx, dy);
-		Text(rp, localtext, strlen(localtext));
+		Text(rp, localtext, (UWORD)strlen(localtext));
 		free(localtext);
 	}
 
diff --git a/amiga/gui.c b/amiga/gui.c
index 4490438c6..837063639 100644
--- a/amiga/gui.c
+++ b/amiga/gui.c
@@ -4996,7 +4996,7 @@ static void gui_window_set_status(struct gui_window *g, const char *text)
 		if(utf8text == NULL) return;
 
 		GetAttr(GA_Width, g->shared->objects[GID_STATUS], (ULONG *)&size);
-		chars = TextFit(&scrn->RastPort, utf8text, strlen(utf8text),
+		chars = TextFit(&scrn->RastPort, utf8text, (UWORD)strlen(utf8text),
 					&textex, NULL, 1, size - 4, scrn->RastPort.TxHeight);
 
 		utf8text[chars] = 0;