diff --git a/project/common.mk b/project/common.mk
index a52f593..95f765d 100644
--- a/project/common.mk
+++ b/project/common.mk
@@ -22,6 +22,7 @@ API_SRCS = \
 INTERNAL_SRCS = \
 	src/internal/$(PACKAGE)_dprintf_impl.c \
 	src/internal/$(PACKAGE)_errinfo_impl.c \
+	src/internal/$(PACKAGE)_hexfmt_impl.c \
 
 APP_SRCS = \
 	src/mdso.c
diff --git a/project/headers.mk b/project/headers.mk
index a238cfe..d4a351a 100644
--- a/project/headers.mk
+++ b/project/headers.mk
@@ -14,6 +14,7 @@ INTERNAL_HEADERS = \
 	$(PROJECT_DIR)/src/internal/$(PACKAGE)_dprintf_impl.h \
 	$(PROJECT_DIR)/src/internal/$(PACKAGE)_driver_impl.h \
 	$(PROJECT_DIR)/src/internal/$(PACKAGE)_errinfo_impl.h \
+	$(PROJECT_DIR)/src/internal/$(PACKAGE)_hexfmt_impl.h \
 	$(PROJECT_DIR)/src/internal/$(PACKAGE)_object_impl.h \
 
 ALL_HEADERS = $(API_HEADERS) $(INTERNAL_HEADERS)
diff --git a/src/internal/mdso_hexfmt_impl.c b/src/internal/mdso_hexfmt_impl.c
new file mode 100644
index 0000000..33d337b
--- /dev/null
+++ b/src/internal/mdso_hexfmt_impl.c
@@ -0,0 +1,35 @@
+/****************************************************************/
+/*  mdso: midipix dso scavenger                                 */
+/*  Copyright (C) 2015--2024  SysDeer Technologies, LLC         */
+/*  Released under GPLv2 and GPLv3; see COPYING.MDSO.           */
+/****************************************************************/
+
+#include <stdint.h>
+
+char buf[256] = {0};
+
+static unsigned char mdso_hexfmt[16] = {
+	'0','1','2','3','4','5','6','7',
+	'8','9','a','b','c','d','e','f',
+};
+
+void mdso_write_hex_64(char * ch, uint64_t val)
+{
+	ch[0xf] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0xe] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0xd] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0xc] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0xb] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0xa] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0x9] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0x8] = mdso_hexfmt[val % 16]; val >>= 4;
+
+	ch[0x7] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0x6] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0x5] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0x4] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0x3] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0x2] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0x1] = mdso_hexfmt[val % 16]; val >>= 4;
+	ch[0x0] = mdso_hexfmt[val % 16]; val >>= 4;
+}
diff --git a/src/internal/mdso_hexfmt_impl.h b/src/internal/mdso_hexfmt_impl.h
new file mode 100644
index 0000000..1ad74d1
--- /dev/null
+++ b/src/internal/mdso_hexfmt_impl.h
@@ -0,0 +1,14 @@
+/****************************************************************/
+/*  mdso: midipix dso scavenger                                 */
+/*  Copyright (C) 2015--2024  SysDeer Technologies, LLC         */
+/*  Released under GPLv2 and GPLv3; see COPYING.MDSO.           */
+/****************************************************************/
+
+#ifndef MDSO_HEXFMT_IMPL_H
+#define MDSO_HEXFMT_IMPL_H
+
+#include <stdint.h>
+
+void mdso_write_hex_64(char * ch, uint64_t val);
+
+#endif
diff --git a/src/util/mdso_create_implib_objects.c b/src/util/mdso_create_implib_objects.c
index 0da806d..d165c34 100644
--- a/src/util/mdso_create_implib_objects.c
+++ b/src/util/mdso_create_implib_objects.c
@@ -9,19 +9,50 @@
 #include <string.h>
 
 #include <mdso/mdso.h>
+#include "mdso_hexfmt_impl.h"
 #include "mdso_errinfo_impl.h"
 
-static void mdso_init_objname(char * buf, const char * fmt, const char * str)
+static void mdso_init_symentry(char * ch, const char * str)
 {
-	char			hexstr[24];
-	long long unsigned int	crc64;
-
-	if (strlen(str) + strlen(fmt) > (PATH_MAX - 1)) {
-		crc64 = mdso_crc64_mbstr((const unsigned char *)str,0);
-		sprintf(hexstr,"%llx",crc64);
-		sprintf(buf,fmt,hexstr);
-	} else
-		sprintf(buf,fmt,str);
+	uint64_t crc64;
+	unsigned slen = 11;
+
+	ch[0] = '.';
+	ch++;
+
+	if (strlen(str) > (PATH_MAX - slen - 1)) {
+		crc64 = mdso_crc64_mbstr((unsigned char *)str,0);
+		mdso_write_hex_64(ch,crc64);
+		ch = &ch[16];
+	} else {
+		for (; *str; )
+			*ch++ = *str++;
+	}
+
+	memcpy(ch,"_symentry.o",slen);
+	ch[slen] = '\0';
+}
+
+static void mdso_init_dsometa(char * ch, const char * str)
+{
+	uint64_t crc64;
+	unsigned slen = 9;
+
+	memcpy(ch,".dsometa_",slen);
+	ch = &ch[slen];
+
+	if (strlen(str) > (PATH_MAX - slen - 1)) {
+		crc64 = mdso_crc64_mbstr((unsigned char *)str,0);
+		mdso_write_hex_64(ch,crc64);
+		ch = &ch[16];
+	} else {
+		for (; *str; )
+			*ch++ = *str++;
+	}
+
+	ch[0] = '.';
+	ch[1] = 'o';
+	ch[2] = '\0';
 }
 
 static void mdso_init_object(struct mdso_object * obj, const char * objname)
@@ -44,7 +75,7 @@ int  mdso_create_implib_objects(const struct mdso_driver_ctx * dctx)
 			return MDSO_NESTED_ERROR(dctx);
 
 		for (sym=uctx->syms; *sym; sym++) {
-			mdso_init_objname(objname,".%s_symentry.o",*sym);
+			mdso_init_symentry(objname,*sym);
 			mdso_init_object(&obj,objname);
 
 			if (mdso_objgen_symentry(dctx,*sym,&obj) < 0)
@@ -55,7 +86,7 @@ int  mdso_create_implib_objects(const struct mdso_driver_ctx * dctx)
 	}
 
 	/* dsometa */
-	mdso_init_objname(objname,".dsometa_%s.o",dctx->cctx->libname);
+	mdso_init_dsometa(objname,dctx->cctx->libname);
 	mdso_init_object(&obj,objname);
 
 	if (mdso_objgen_dsometa(dctx,&obj) < 0)