diff --git a/contrib/10.roundtrip/emyg_atod.c b/contrib/10.roundtrip/emyg_atod.c
index 321d80e9..f742e15c 100644
--- a/contrib/10.roundtrip/emyg_atod.c
+++ b/contrib/10.roundtrip/emyg_atod.c
@@ -736,6 +736,11 @@ no_conv:
     return minus ? -res : res;
 }
 
+double emyg_atod (const char *nptr)
+{
+    return emyg_strtod(nptr, NULL);
+}
+
 #ifdef TESTING_QUOREM
 
 int main (int argc, char **argv)
diff --git a/contrib/10.roundtrip/emyg_atod.h b/contrib/10.roundtrip/emyg_atod.h
index 7857a36e..3c875fbc 100644
--- a/contrib/10.roundtrip/emyg_atod.h
+++ b/contrib/10.roundtrip/emyg_atod.h
@@ -7,6 +7,8 @@ extern "C" {
 
 double emyg_strtod (const char *nptr, char **endptr);
 
+double emyg_atod (const char *nptr);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/contrib/10.roundtrip/nitro.mk b/contrib/10.roundtrip/nitro.mk
index 57919a80..e28f3ffb 100644
--- a/contrib/10.roundtrip/nitro.mk
+++ b/contrib/10.roundtrip/nitro.mk
@@ -1,4 +1,4 @@
-CONTRIB_DEFS += -DPIC_CSTRING_TO_DOUBLE=emyg_strtod -DPIC_DOUBLE_TO_CSTRING=emyg_dtoa
+CONTRIB_DEFS += -DPIC_CSTRING_TO_DOUBLE=emyg_atod -DPIC_DOUBLE_TO_CSTRING=emyg_dtoa
 
 CONTRIB_SRCS += contrib/10.roundtrip/emyg_dtoa.c \
                 contrib/10.roundtrip/emyg_atod.c