diff --git a/src/fdr/fdr_compile.cpp b/src/fdr/fdr_compile.cpp
index cd0013e4..6f2de3d9 100644
--- a/src/fdr/fdr_compile.cpp
+++ b/src/fdr/fdr_compile.cpp
@@ -175,6 +175,7 @@ bytecode_ptr<FDR> FDRCompiler::setupFDR() {
     fdr->size = size;
     fdr->engineID = eng.getID();
     fdr->maxStringLen = verify_u32(maxLen(lits));
+    fdr->numStrings = verify_u32(lits.size());
     assert(eng.bits > 8 && eng.bits < 16); // we allow domains 9 to 15 only
     fdr->domain = eng.bits;
     fdr->domainMask = (1 << eng.bits) - 1;
diff --git a/src/fdr/fdr_dump.cpp b/src/fdr/fdr_dump.cpp
index 3fe9062a..ae81f257 100644
--- a/src/fdr/fdr_dump.cpp
+++ b/src/fdr/fdr_dump.cpp
@@ -86,7 +86,7 @@ void dumpTeddy(const Teddy *teddy, FILE *f) {
     fprintf(f, "    masks      %u\n", des->numMasks);
     fprintf(f, "    buckets    %u\n", des->getNumBuckets());
     fprintf(f, "    packed     %s\n", des->packed ? "true" : "false");
-    fprintf(f, "    strings    ???\n");
+    fprintf(f, "    strings    %u\n", teddy->numStrings);
     fprintf(f, "    size       %zu bytes\n", fdrSize((const FDR *)teddy));
     fprintf(f, "    max length %u\n", teddy->maxStringLen);
     fprintf(f, "    floodoff   %u (%x)\n", teddy->floodOffset,
@@ -107,7 +107,7 @@ void dumpFDR(const FDR *fdr, FILE *f) {
 
     fprintf(f, "    domain     %u\n", fdr->domain);
     fprintf(f, "    stride     %u\n", fdr->stride);
-    fprintf(f, "    strings    ???\n");
+    fprintf(f, "    strings    %u\n", fdr->numStrings);
     fprintf(f, "    size       %zu bytes\n", fdrSize(fdr));
     fprintf(f, "    max length %u\n", fdr->maxStringLen);
     fprintf(f, "    floodoff   %u (%x)\n", fdr->floodOffset, fdr->floodOffset);
diff --git a/src/fdr/fdr_internal.h b/src/fdr/fdr_internal.h
index 8109d1e8..2315b2d8 100644
--- a/src/fdr/fdr_internal.h
+++ b/src/fdr/fdr_internal.h
@@ -69,6 +69,7 @@ struct FDR {
     u32 engineID;
     u32 size;
     u32 maxStringLen;
+    u32 numStrings;
     u32 confOffset;
     u32 floodOffset;
     u8 stride; /* stride - how frequently the data is consulted by the first
diff --git a/src/fdr/teddy_compile.cpp b/src/fdr/teddy_compile.cpp
index 14f19354..a35e5900 100644
--- a/src/fdr/teddy_compile.cpp
+++ b/src/fdr/teddy_compile.cpp
@@ -520,6 +520,7 @@ bytecode_ptr<FDR> TeddyCompiler::build() {
     teddy->size = size;
     teddy->engineID = eng.getID();
     teddy->maxStringLen = verify_u32(maxLen(lits));
+    teddy->numStrings = verify_u32(lits.size());
 
     // Write confirm structures.
     u8 *ptr = teddy_base + ROUNDUP_CL(headerSize) + ROUNDUP_CL(maskLen) +
diff --git a/src/fdr/teddy_internal.h b/src/fdr/teddy_internal.h
index d1752452..174710bc 100644
--- a/src/fdr/teddy_internal.h
+++ b/src/fdr/teddy_internal.h
@@ -55,6 +55,7 @@ struct Teddy {
     u32 engineID;
     u32 size;
     u32 maxStringLen;
+    u32 numStrings;
     u32 confOffset;
     u32 floodOffset;
 };