diff --git a/armsrc/hitagS.c b/armsrc/hitagS.c
index d4f4a775b..0b920e400 100644
--- a/armsrc/hitagS.c
+++ b/armsrc/hitagS.c
@@ -1160,21 +1160,6 @@ static void hts_send_receive(const uint8_t *tx, size_t txlen, uint8_t *rx, size_
     *prxbits = k;
 }
 
-static size_t concatbits(uint8_t *dst, size_t dstskip, const uint8_t *src, size_t srcstart, size_t srclen) {
-    // erase dstbuf bits that will be overriden
-    dst[dstskip / 8] &= 0xFF - ((1 << (7 - (dstskip % 8) + 1)) - 1);
-    for (size_t i = (dstskip / 8) + 1; i <= (dstskip + srclen) / 8; i++) {
-        dst[i] = 0;
-    }
-
-    for (size_t i = 0; i < srclen; i++) {
-        // equiv of dstbufbits[dstbufskip + i] = srcbufbits[srcbufstart + i]
-        dst[(dstskip + i) / 8] |= ((src[(srcstart + i) / 8] >> (7 - ((srcstart + i) % 8))) & 1) << (7 - ((dstskip + i) % 8));
-    }
-
-    return dstskip + srclen;
-}
-
 static int hts_select_tag(const lf_hitag_data_t *packet, uint8_t *tx, size_t sizeoftx, uint8_t *rx, size_t sizeofrx, int t_wait, bool ledcontrol) {
 
     StopTicks();
diff --git a/client/src/cmdlfem410x.c b/client/src/cmdlfem410x.c
index 7a01807ff..a7f9d3e7c 100644
--- a/client/src/cmdlfem410x.c
+++ b/client/src/cmdlfem410x.c
@@ -651,21 +651,6 @@ static int CmdEM410xSpoof(const char *Cmd) {
     return PM3_SUCCESS;
 }
 
-static size_t concatbits(uint8_t *dst, size_t dstskip, const uint8_t *src, size_t srcstart, size_t srclen) {
-    // erase dstbuf bits that will be overriden
-    dst[dstskip / 8] &= 0xFF - ((1 << (7 - (dstskip % 8) + 1)) - 1);
-    for (size_t i = (dstskip / 8) + 1; i <= (dstskip + srclen) / 8; i++) {
-        dst[i] = 0;
-    }
-
-    for (size_t i = 0; i < srclen; i++) {
-        // equiv of dstbufbits[dstbufskip + i] = srcbufbits[srcbufstart + i]
-        dst[(dstskip + i) / 8] |= ((src[(srcstart + i) / 8] >> (7 - ((srcstart + i) % 8))) & 1) << (7 - ((dstskip + i) % 8));
-    }
-
-    return dstskip + srclen;
-}
-
 static int CmdEM410xClone(const char *Cmd) {
     CLIParserContext *ctx;
     CLIParserInit(&ctx, "lf em 410x clone",
diff --git a/common/commonutil.c b/common/commonutil.c
index 09608ac9e..439e1e3cb 100644
--- a/common/commonutil.c
+++ b/common/commonutil.c
@@ -563,3 +563,18 @@ void reverse_arraybytes_copy(uint8_t *arr, uint8_t *dest, size_t len) {
         dest[i] = reflect8(arr[i]);
     }
 }
+
+size_t concatbits(uint8_t *dst, size_t dstskip, const uint8_t *src, size_t srcstart, size_t srclen) {
+    // erase dstbuf bits that will be overriden
+    dst[dstskip / 8] &= 0xFF - ((1 << (7 - (dstskip % 8) + 1)) - 1);
+    for (size_t i = (dstskip / 8) + 1; i <= (dstskip + srclen) / 8; i++) {
+        dst[i] = 0;
+    }
+
+    for (size_t i = 0; i < srclen; i++) {
+        // equiv of dstbufbits[dstbufskip + i] = srcbufbits[srcbufstart + i]
+        dst[(dstskip + i) / 8] |= ((src[(srcstart + i) / 8] >> (7 - ((srcstart + i) % 8))) & 1) << (7 - ((dstskip + i) % 8));
+    }
+
+    return dstskip + srclen;
+}
\ No newline at end of file
diff --git a/common/commonutil.h b/common/commonutil.h
index c5c7279d9..62b1b78e7 100644
--- a/common/commonutil.h
+++ b/common/commonutil.h
@@ -133,4 +133,6 @@ bool hexstr_to_byte_array(const char *hexstr, uint8_t *d, size_t *n);
 
 void reverse_arraybytes(uint8_t *arr, size_t len);
 void reverse_arraybytes_copy(uint8_t *arr, uint8_t *dest, size_t len);
+
+size_t concatbits(uint8_t *dst, size_t dstskip, const uint8_t *src, size_t srcstart, size_t srclen);
 #endif